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CGI(3)		 Perl Programmers Reference Guide	   CGI(3)

NAME
       CGI - Simple Common Gateway Interface Class

SYNOPSIS
	 # CGI script that creates a fill-out form
	 # and echoes back its values.

	 use CGI qw/:standard/;
	 print header,
	       start_html('A Simple Example'),
	       h1('A Simple Example'),
	       start_form,
	       "What's your name? ",textfield('name'),p,
	       "What's the combination?", p,
	       checkbox_group(-name=>'words',
			      -values=>['eenie','meenie','minie','moe'],
			      -defaults=>['eenie','minie']), p,
	       "What's your favorite color? ",
	       popup_menu(-name=>'color',
			  -values=>['red','green','blue','chartreuse']),p,
	       submit,
	       end_form,
	       hr;

	  if (param()) {
	      print "Your name is",em(param('name')),p,
		    "The keywords are: ",em(join(", ",param('words'))),p,
		    "Your favorite color is ",em(param('color')),
		    hr;
	  }

ABSTRACT
       This perl library uses perl5 objects to make it easy to
       create Web fill-out forms and parse their contents.  This
       package defines CGI objects, entities that contain the
       values of the current query string and other state vari
       ables.  Using a CGI object's methods, you can examine key
       words and parameters passed to your script, and create
       forms whose initial values are taken from the current
       query (thereby preserving state information).  The module
       provides shortcut functions that produce boilerplate HTML,
       reducing typing and coding errors. It also provides func
       tionality for some of the more advanced features of CGI
       scripting, including support for file uploads, cookies,
       cascading style sheets, server push, and frames.

       CGI.pm also provides a simple function-oriented program
       ming style for those who don't need its object-oriented
       features.

       The current version of CGI.pm is available at

	 http://www.genome.wi.mit.edu/ftp/pub/software/WWW/cgi_docs.html
	 ftp://ftp-genome.wi.mit.edu/pub/software/WWW/

DESCRIPTION

       PROGRAMMING STYLE

       There are two styles of programming with CGI.pm, an
       object-oriented style and a function-oriented style.  In
       the object-oriented style you create one or more CGI
       objects and then use object methods to create the various
       elements of the page.  Each CGI object starts out with the
       list of named parameters that were passed to your CGI
       script by the server.  You can modify the objects, save
       them to a file or database and recreate them.  Because
       each object corresponds to the "state" of the CGI script,
       and because each object's parameter list is independent of
       the others, this allows you to save the state of the
       script and restore it later.

       For example, using the object oriented style, here is how
       you create a simple "Hello World" HTML page:

	  #!/usr/local/bin/perl -w
	  use CGI;			       # load CGI routines
	  $q = new CGI;			       # create new CGI object
	  print $q->header,		       # create the HTTP header
		$q->start_html('hello world'), # start the HTML
		$q->h1('hello world'),	       # level 1 header
		$q->end_html;		       # end the HTML

       In the function-oriented style, there is one default CGI
       object that you rarely deal with directly.  Instead you
       just call functions to retrieve CGI parameters, create
       HTML tags, manage cookies, and so on.  This provides you
       with a cleaner programming interface, but limits you to
       using one CGI object at a time.	The following example
       prints the same page, but uses the function-oriented
       interface.  The main differences are that we now need to
       import a set of functions into our name space (usually the
       "standard" functions), and we don't need to create the CGI
       object.

	  #!/usr/local/bin/perl
	  use CGI qw/:standard/;	   # load standard CGI routines
	  print header,			   # create the HTTP header
		start_html('hello world'), # start the HTML
		h1('hello world'),	   # level 1 header
		end_html;		   # end the HTML

       The examples in this document mainly use the object-ori
       ented style.  See HOW TO IMPORT FUNCTIONS for important
       information on function-oriented programming in CGI.pm

       CALLING CGI.PM ROUTINES

       Most CGI.pm routines accept several arguments, sometimes
       as many as 20 optional ones!  To simplify this interface,
       all routines use a named argument calling style that looks
       like this:

	  print $q->header(-type=>'image/gif',-expires=>'+3d');

       Each argument name is preceded by a dash.  Neither case
       nor order matters in the argument list.	-type, -Type, and
       -TYPE are all acceptable.  In fact, only the first argu
       ment needs to begin with a dash.	 If a dash is present in
       the first argument, CGI.pm assumes dashes for the subse
       quent ones.

       Several routines are commonly called with just one argu
       ment.  In the case of these routines you can provide the
       single argument without an argument name.  header() hap
       pens to be one of these routines.  In this case, the sin
       gle argument is the document type.

	  print $q->header('text/html');

       Other such routines are documented below.

       Sometimes named arguments expect a scalar, sometimes a
       reference to an array, and sometimes a reference to a
       hash.  Often, you can pass any type of argument and the
       routine will do whatever is most appropriate.  For exam
       ple, the param() routine is used to set a CGI parameter to
       a single or a multi-valued value.  The two cases are shown
       below:

	  $q->param(-name=>'veggie',-value=>'tomato');
	  $q->param(-name=>'veggie',-value=>['tomato','tomahto','potato','potahto']);

       A large number of routines in CGI.pm actually aren't
       specifically defined in the module, but are generated
       automatically as needed.	 These are the "HTML shortcuts,"
       routines that generate HTML tags for use in dynamically-
       generated pages.	 HTML tags have both attributes (the
       attribute="value" pairs within the tag itself) and con
       tents (the part between the opening and closing pairs.)
       To distinguish between attributes and contents, CGI.pm
       uses the convention of passing HTML attributes as a hash
       reference as the first argument, and the contents, if any,
       as any subsequent arguments.  It works out like this:

	  Code				 Generated HTML
	  ----				 --------------
	  h1()				 <H1>
	  h1('some','contents');	 <H1>some contents</H1>
	  h1({-align=>left});		 <H1 ALIGN="LEFT">
	  h1({-align=>left},'contents'); <H1 ALIGN="LEFT">contents</H1>

       HTML tags are described in more detail later.

       Many newcomers to CGI.pm are puzzled by the difference
       between the calling conventions for the HTML shortcuts,
       which require curly braces around the HTML tag attributes,
       and the calling conventions for other routines, which man
       age to generate attributes without the curly brackets.
       Don't be confused.  As a convenience the curly braces are
       optional in all but the HTML shortcuts.	If you like, you
       can use curly braces when calling any routine that takes
       named arguments.	 For example:

	  print $q->header( {-type=>'image/gif',-expires=>'+3d'} );

       If you use the -w switch, you will be warned that some
       CGI.pm argument names conflict with built-in Perl func
       tions.  The most frequent of these is the -values argu
       ment, used to create multi-valued menus, radio button
       clusters and the like.  To get around this warning, you
       have several choices:

       1.  Use another name for the argument, if one is avail
	   able.  For example, -value is an alias for -values.

       2.  Change the capitalization, e.g. -Values

       3.  Put quotes around the argument name, e.g. '-values'

       Many routines will do something useful with a named argu
       ment that it doesn't recognize.	For example, you can pro
       duce non-standard HTTP header fields by providing them as
       named arguments:

	 print $q->header(-type	 =>  'text/html',
			  -cost	 =>  'Three smackers',
			  -annoyance_level => 'high',
			  -complaints_to   => 'bit bucket');

       This will produce the following nonstandard HTTP header:

	  HTTP/1.0 200 OK
	  Cost: Three smackers
	  Annoyance-level: high
	  Complaints-to: bit bucket
	  Content-type: text/html

       Notice the way that underscores are translated automati
       cally into hyphens.  HTML-generating routines perform a
       different type of translation.

       This feature allows you to keep up with the rapidly chang
       ing HTTP and HTML "standards".

       CREATING A NEW QUERY OBJECT (OBJECT-ORIENTED STYLE):

	    $query = new CGI;

       This will parse the input (from both POST and GET methods)
       and store it into a perl5 object called $query.

       CREATING A NEW QUERY OBJECT FROM AN INPUT FILE

	    $query = new CGI(INPUTFILE);

       If you provide a file handle to the new() method, it will
       read parameters from the file (or STDIN, or whatever).
       The file can be in any of the forms describing below under
       debugging (i.e. a series of newline delimited TAG=VALUE
       pairs will work).  Conveniently, this type of file is cre
       ated by the save() method (see below).  Multiple records
       can be saved and restored.

       Perl purists will be pleased to know that this syntax
       accepts references to file handles, or even references to
       filehandle globs, which is the "official" way to pass a
       filehandle:

	   $query = new CGI(\*STDIN);

       You can also initialize the CGI object with a FileHandle
       or IO::File object.

       If you are using the function-oriented interface and want
       to initialize CGI state from a file handle, the way to do
       this is with restore_parameters().  This will (re)initial
       ize the default CGI object from the indicated file handle.

	   open (IN,"test.in") || die;
	   restore_parameters(IN);
	   close IN;

       You can also initialize the query object from an associa
       tive array reference:

	   $query = new CGI( {'dinosaur'=>'barney',
			      'song'=>'I love you',
			      'friends'=>[qw/Jessica George Nancy/]}
			   );

       or from a properly formatted, URL-escaped query string:

	   $query = new CGI('dinosaur=barney&color=purple');

       or from a previously existing CGI object (currently this
       clones the parameter list, but none of the other object-
       specific fields, such as autoescaping):

	   $old_query = new CGI;
	   $new_query = new CGI($old_query);

       To create an empty query, initialize it from an empty
       string or hash:

	  $empty_query = new CGI("");

	      -or-

	  $empty_query = new CGI({});

       FETCHING A LIST OF KEYWORDS FROM THE QUERY:

	    @keywords = $query->keywords

       If the script was invoked as the result of an <ISINDEX>
       search, the parsed keywords can be obtained as an array
       using the keywords() method.

       FETCHING THE NAMES OF ALL THE PARAMETERS PASSED TO YOUR
       SCRIPT:

	    @names = $query->param

       If the script was invoked with a parameter list (e.g.
       "name1=value1&name2=value2&name3=value3"), the param()
       method will return the parameter names as a list.  If the
       script was invoked as an <ISINDEX> script and contains a
       string without ampersands (e.g. "value1+value2+value3") ,
       there will be a single parameter named "keywords" contain
       ing the "+"-delimited keywords.

       NOTE: As of version 1.5, the array of parameter names
       returned will be in the same order as they were submitted
       by the browser.	Usually this order is the same as the
       order in which the parameters are defined in the form
       (however, this isn't part of the spec, and so isn't guar
       anteed).

       FETCHING THE VALUE OR VALUES OF A SINGLE NAMED PARAMETER:

	   @values = $query->param('foo');

		     -or-

	   $value = $query->param('foo');

       Pass the param() method a single argument to fetch the
       value of the named parameter. If the parameter is multi
       valued (e.g. from multiple selections in a scrolling
       list), you can ask to receive an array.	Otherwise the
       method will return a single value.

       If a value is not given in the query string, as in the
       queries "name1=&name2=" or "name1&name2", it will be
       returned as an empty string.  This feature is new in 2.63.

       SETTING THE VALUE(S) OF A NAMED PARAMETER:

	   $query->param('foo','an','array','of','values');

       This sets the value for the named parameter 'foo' to an
       array of values.	 This is one way to change the value of a
       field AFTER the script has been invoked once before.
       (Another way is with the -override parameter accepted by
       all methods that generate form elements.)

       param() also recognizes a named parameter style of calling
       described in more detail later:

	   $query->param(-name=>'foo',-values=>['an','array','of','values']);

				     -or-

	   $query->param(-name=>'foo',-value=>'the value');

       APPENDING ADDITIONAL VALUES TO A NAMED PARAMETER:

	  $query->append(-name=>'foo',-values=>['yet','more','values']);

       This adds a value or list of values to the named parame
       ter.  The values are appended to the end of the parameter
       if it already exists.  Otherwise the parameter is created.
       Note that this method only recognizes the named argument
       calling syntax.

       IMPORTING ALL PARAMETERS INTO A NAMESPACE:

	  $query->import_names('R');

       This creates a series of variables in the 'R' namespace.
       For example, $R::foo, @R:foo.  For keyword lists, a vari
       able @R::keywords will appear.  If no namespace is given,
       this method will assume 'Q'.  WARNING:  don't import any
       thing into 'main'; this is a major security risk!!!!

       In older versions, this method was called import().  As of
       version 2.20, this name has been removed completely to
       avoid conflict with the built-in Perl module import opera
       tor.

       DELETING A PARAMETER COMPLETELY:

	   $query->delete('foo');

       This completely clears a parameter.  It sometimes useful
       for resetting parameters that you don't want passed down
       between script invocations.

       If you are using the function call interface, use
       "Delete()" instead to avoid conflicts with Perl's built-in
       delete operator.

       DELETING ALL PARAMETERS:

	  $query->delete_all();

       This clears the CGI object completely.  It might be useful
       to ensure that all the defaults are taken when you create
       a fill-out form.

       Use Delete_all() instead if you are using the function
       call interface.

       DIRECT ACCESS TO THE PARAMETER LIST:

	  $q->param_fetch('address')->[1] = '1313 Mockingbird Lane';
	  unshift @{$q->param_fetch(-name=>'address')},'George Munster';

       If you need access to the parameter list in a way that
       isn't covered by the methods above, you can obtain a
       direct reference to it by calling the param_fetch() method
       with the name of the .  This will return an array refer
       ence to the named parameters, which you then can manipu
       late in any way you like.

       You can also use a named argument style using the -name
       argument.

       FETCHING THE PARAMETER LIST AS A HASH:

	   $params = $q->Vars;
	   print $params->{'address'};
	   @foo = split("\0",$params->{'foo'});
	   %params = $q->Vars;

	   use CGI ':cgi-lib';
	   $params = Vars;

       Many people want to fetch the entire parameter list as a
       hash in which the keys are the names of the CGI parame
       ters, and the values are the parameters' values.	 The
       Vars() method does this.	 Called in a scalar context, it
       returns the parameter list as a tied hash reference.
       Changing a key changes the value of the parameter in the
       underlying CGI parameter list.  Called in a list context,
       it returns the parameter list as an ordinary hash.  This
       allows you to read the contents of the parameter list, but
       not to change it.

       When using this, the thing you must watch out for are mul
       tivalued CGI parameters.	 Because a hash cannot distin
       guish between scalar and list context, multivalued parame
       ters will be returned as a packed string, separated by the
       "\0" (null) character.  You must split this packed string
       in order to get at the individual values.  This is the
       convention introduced long ago by Steve Brenner in his
       cgi-lib.pl module for Perl version 4.

       If you wish to use Vars() as a function, import the :cgi-
       lib set of function calls (also see the section on CGI-LIB
       compatibility).

       SAVING THE STATE OF THE SCRIPT TO A FILE:

	   $query->save(FILEHANDLE)

       This will write the current state of the form to the
       provided filehandle.  You can read it back in by providing
       a filehandle to the new() method.  Note that the filehan
       dle can be a file, a pipe, or whatever!

       The format of the saved file is:

	       NAME1=VALUE1
	       NAME1=VALUE1'
	       NAME2=VALUE2
	       NAME3=VALUE3
	       =

       Both name and value are URL escaped.  Multi-valued CGI
       parameters are represented as repeated names.  A session
       record is delimited by a single = symbol.  You can write
       out multiple records and read them back in with several
       calls to new.  You can do this across several sessions by
       opening the file in append mode, allowing you to create
       primitive guest books, or to keep a history of users'
       queries.	 Here's a short example of creating multiple ses
       sion records:

	  use CGI;

	  open (OUT,">>test.out") || die;
	  $records = 5;
	  foreach (0..$records) {
	      my $q = new CGI;
	      $q->param(-name=>'counter',-value=>$_);
	      $q->save(OUT);
	  }
	  close OUT;

	  # reopen for reading
	  open (IN,"test.out") || die;
	  while (!eof(IN)) {
	      my $q = new CGI(IN);
	      print $q->param('counter'),"\n";
	  }

       The file format used for save/restore is identical to that
       used by the Whitehead Genome Center's data exchange format
       "Boulderio", and can be manipulated and even databased
       using Boulderio utilities.  See

	 http://stein.cshl.org/boulder/

       for further details.

       If you wish to use this method from the function-oriented
       (non-OO) interface, the exported name for this method is
       save_parameters().

       RETRIEVING CGI ERRORS

       Errors can occur while processing user input, particularly
       when processing uploaded files.	When these errors occur,
       CGI will stop processing and return an empty parameter
       list.  You can test for the existence and nature of errors
       using the cgi_error() function.	The error messages are
       formatted as HTTP status codes. You can either incorporate
       the error text into an HTML page, or use it as the value
       of the HTTP status:

	   my $error = $q->cgi_error;
	   if ($error) {
	       print $q->header(-status=>$error),
		     $q->start_html('Problems'),
		     $q->h2('Request not processed'),
		     $q->strong($error);
	       exit 0;
	   }

       When using the function-oriented interface (see the next
       section), errors may only occur the first time you call
       param(). Be ready for this!

       USING THE FUNCTION-ORIENTED INTERFACE

       To use the function-oriented interface, you must specify
       which CGI.pm routines or sets of routines to import into
       your script's namespace.	 There is a small overhead asso
       ciated with this importation, but it isn't much.

	  use CGI <list of methods>;

       The listed methods will be imported into the current pack
       age; you can call them directly without creating a CGI
       object first.  This example shows how to import the
       param() and header() methods, and then use them directly:

	  use CGI 'param','header';
	  print header('text/plain');
	  $zipcode = param('zipcode');

       More frequently, you'll import common sets of functions by
       referring to the groups by name.	 All function sets are
       preceded with a ":" character as in ":html3" (for tags
       defined in the HTML 3 standard).

       Here is a list of the function sets you can import:

       :cgi
	   Import all CGI-handling methods, such as param(),
	   path_info() and the like.

       :form
	   Import all fill-out form generating methods, such as
	   textfield().

       :html2
	   Import all methods that generate HTML 2.0 standard
	   elements.

       :html3
	   Import all methods that generate HTML 3.0 proposed
	   elements (such as <table>, <super> and <sub>).

       :netscape
	   Import all methods that generate Netscape-specific
	   HTML extensions.

       :html
	   Import all HTML-generating shortcuts (i.e. 'html2' +
	   'html3' + 'netscape')...

       :standard
	   Import "standard" features, 'html2', 'html3', 'form'
	   and 'cgi'.

       :all
	   Import all the available methods.  For the full list,
	   see the CGI.pm code, where the variable %EXPORT_TAGS
	   is defined.

       If you import a function name that is not part of CGI.pm,
       the module will treat it as a new HTML tag and generate
       the appropriate subroutine.  You can then use it like any
       other HTML tag.	This is to provide for the rapidly-evolv
       ing HTML "standard."  For example, say Microsoft comes out
       with a new tag called <GRADIENT> (which causes the user's
       desktop to be flooded with a rotating gradient fill until
       his machine reboots).  You don't need to wait for a new
       version of CGI.pm to start using it immediately:

	  use CGI qw/:standard :html3 gradient/;
	  print gradient({-start=>'red',-end=>'blue'});

       Note that in the interests of execution speed CGI.pm does
       not use the standard the Exporter manpage syntax for spec
       ifying load symbols.  This may change in the future.

       If you import any of the state-maintaining CGI or form-
       generating methods, a default CGI object will be created
       and initialized automatically the first time you use any
       of the methods that require one to be present.  This
       includes param(), textfield(), submit() and the like.  (If
       you need direct access to the CGI object, you can find it
       in the global variable $CGI::Q).	 By importing CGI.pm
       methods, you can create visually elegant scripts:

	  use CGI qw/:standard/;
	  print
	      header,
	      start_html('Simple Script'),
	      h1('Simple Script'),
	      start_form,
	      "What's your name? ",textfield('name'),p,
	      "What's the combination?",
	      checkbox_group(-name=>'words',
			     -values=>['eenie','meenie','minie','moe'],
			     -defaults=>['eenie','moe']),p,
	      "What's your favorite color?",
	      popup_menu(-name=>'color',
			 -values=>['red','green','blue','chartreuse']),p,
	      submit,
	      end_form,
	      hr,"\n";

	   if (param) {
	      print
		  "Your name is ",em(param('name')),p,
		  "The keywords are: ",em(join(", ",param('words'))),p,
		  "Your favorite color is ",em(param('color')),".\n";
	   }
	   print end_html;

       PRAGMAS

       In addition to the function sets, there are a number of
       pragmas that you can import.  Pragmas, which are always
       preceded by a hyphen, change the way that CGI.pm functions
       in various ways.	 Pragmas, function sets, and individual
       functions can all be imported in the same use() line.  For
       example, the following use statement imports the standard
       set of functions and enables debugging mode (pragma
       -debug):

	  use CGI qw/:standard -debug/;

       The current list of pragmas is as follows:

       -any
	   When you use CGI -any, then any method that the query
	   object doesn't recognize will be interpreted as a new
	   HTML tag.  This allows you to support the next ad hoc
	   Netscape or Microsoft HTML extension.  This lets you
	   go wild with new and unsupported tags:

	      use CGI qw(-any);
	      $q=new CGI;
	      print $q->gradient({speed=>'fast',start=>'red',end=>'blue'});

	   Since using <cite>any</cite> causes any mistyped
	   method name to be interpreted as an HTML tag, use it
	   with care or not at all.

       -compile
	   This causes the indicated autoloaded methods to be
	   compiled up front, rather than deferred to later.
	   This is useful for scripts that run for an extended
	   period of time under FastCGI or mod_perl, and for
	   those destined to be crunched by Malcom Beattie's Perl
	   compiler.  Use it in conjunction with the methods or
	   method families you plan to use.

	      use CGI qw(-compile :standard :html3);

	   or even

	      use CGI qw(-compile :all);

	   Note that using the -compile pragma in this way will
	   always have the effect of importing the compiled func
	   tions into the current namespace.  If you want to com
	   pile without importing use the compile() method
	   instead (see below).

       -nosticky
	   This makes CGI.pm not generating the hidden fields
	   .submit and .cgifields. It is very useful if you don't
	   want to have the hidden fields appear in the querys
	   tring in a GET method.  For example, a search script
	   generated this way will have a very nice url with
	   search parameters for bookmarking.

       -no_xhtml
	   By default, CGI.pm versions 2.69 and higher emit XHTML
	   (http://www.w3.org/TR/xhtml1/).  The -no_xhtml pragma
	   disables this feature.  Thanks to Michalis Kabrianis
	   <kabrianis@hellug.gr> for this feature.

       -nph
	   This makes CGI.pm produce a header appropriate for an
	   NPH (no parsed header) script.  You may need to do
	   other things as well to tell the server that the
	   script is NPH.  See the discussion of NPH scripts
	   below.

       -newstyle_urls
	   Separate the name=value pairs in CGI parameter query
	   strings with semicolons rather than ampersands.  For
	   example:

	      ?name=fred;age=24;favorite_color=3

	   Semicolon-delimited query strings are always accepted,
	   but will not be emitted by self_url() and
	   query_string() unless the -newstyle_urls pragma is
	   specified.

	   This became the default in version 2.64.

       -oldstyle_urls
	   Separate the name=value pairs in CGI parameter query
	   strings with ampersands rather than semicolons.  This
	   is no longer the default.

       -autoload
	   This overrides the autoloader so that any function in
	   your program that is not recognized is referred to
	   CGI.pm for possible evaluation.  This allows you to
	   use all the CGI.pm functions without adding them to
	   your symbol table, which is of concern for mod_perl
	   users who are worried about memory consumption.  Warn_
	   ing: when -autoload is in effect, you cannot use
	   "poetry mode" (functions without the parenthesis).
	   Use hr() rather than hr, or add something like use
	   subs qw/hr p header/ to the top of your script.

       -no_debug
	   This turns off the command-line processing features.
	   If you want to run a CGI.pm script from the command
	   line to produce HTML, and you don't want it to read
	   CGI parameters from the command line or STDIN, then
	   use this pragma:

	      use CGI qw(-no_debug :standard);

       -debug
	   This turns on full debugging.  In addition to reading
	   CGI arguments from the command-line processing, CGI.pm
	   will pause and try to read arguments from STDIN, pro
	   ducing the message "(offline mode: enter name=value
	   pairs on standard input)" features.

	   See the section on debugging for more details.

       -private_tempfiles
	   CGI.pm can process uploaded file. Ordinarily it spools
	   the uploaded file to a temporary directory, then
	   deletes the file when done.	However, this opens the
	   risk of eavesdropping as described in the file upload
	   section.  Another CGI script author could peek at this
	   data during the upload, even if it is confidential
	   information. On Unix systems, the -private_tempfiles
	   pragma will cause the temporary file to be unlinked as
	   soon as it is opened and before any data is written
	   into it, reducing, but not eliminating the risk of
	   eavesdropping (there is still a potential race condi
	   tion).  To make life harder for the attacker, the pro
	   gram chooses tempfile names by calculating a 32 bit
	   checksum of the incoming HTTP headers.

	   To ensure that the temporary file cannot be read by
	   other CGI scripts, use suEXEC or a CGI wrapper program
	   to run your script.	The temporary file is created
	   with mode 0600 (neither world nor group readable).

	   The temporary directory is selected using the follow
	   ing algorithm:

	       1. if the current user (e.g. "nobody") has a directory named
	       "tmp" in its home directory, use that (Unix systems only).

	       2. if the environment variable TMPDIR exists, use the location
	       indicated.

	       3. Otherwise try the locations /usr/tmp, /var/tmp, C:\temp,
	       /tmp, /temp, ::Temporary Items, and \WWW_ROOT.

	   Each of these locations is checked that it is a direc
	   tory and is writable.  If not, the algorithm tries the
	   next choice.

       SPECIAL FORMS FOR IMPORTING HTML-TAG FUNCTIONS

       Many of the methods generate HTML tags.	As described
       below, tag functions automatically generate both the open
       ing and closing tags.  For example:

	 print h1('Level 1 Header');

       produces

	 <H1>Level 1 Header</H1>

       There will be some times when you want to produce the
       start and end tags yourself.  In this case, you can use
       the form start_tag_name and end_tag_name, as in:

	 print start_h1,'Level 1 Header',end_h1;

       With a few exceptions (described below), start_tag_name
       and end_tag_name functions are not generated automatically
       when you use CGI.  However, you can specify the tags you
       want to generate start/end functions for by putting an
       asterisk in front of their name, or, alternatively,
       requesting either "start_tag_name" or "end_tag_name" in
       the import list.

       Example:

	 use CGI qw/:standard *table start_ul/;

       In this example, the following functions are generated in
       addition to the standard ones:

       1. start_table() (generates a <TABLE> tag)
       2. end_table() (generates a </TABLE> tag)
       3. start_ul() (generates a <UL> tag)
       4. end_ul() (generates a </UL> tag)

GENERATING DYNAMIC DOCUMENTS
       Most of CGI.pm's functions deal with creating documents on
       the fly.	 Generally you will produce the HTTP header
       first, followed by the document itself.	CGI.pm provides
       functions for generating HTTP headers of various types as
       well as for generating HTML.  For creating GIF images, see
       the GD.pm module.

       Each of these functions produces a fragment of HTML or
       HTTP which you can print out directly so that it displays
       in the browser window, append to a string, or save to a
       file for later use.

       CREATING A STANDARD HTTP HEADER:

       Normally the first thing you will do in any CGI script is
       print out an HTTP header.  This tells the browser what
       type of document to expect, and gives other optional
       information, such as the language, expiration date, and
       whether to cache the document.  The header can also be
       manipulated for special purposes, such as server push and
       pay per view pages.

	       print $query->header;

		    -or-

	       print $query->header('image/gif');

		    -or-

	       print $query->header('text/html','204 No response');

		    -or-

	       print $query->header(-type=>'image/gif',
				    -nph=>1,
				    -status=>'402 Payment required',
				    -expires=>'+3d',
				    -cookie=>$cookie,
				    -charset=>'utf-7',
				    -attachment=>'foo.gif',
				    -Cost=>'$2.00');

       header() returns the Content-type: header.  You can pro
       vide your own MIME type if you choose, otherwise it
       defaults to text/html.  An optional second parameter spec
       ifies the status code and a human-readable message.  For
       example, you can specify 204, "No response" to create a
       script that tells the browser to do nothing at all.

       The last example shows the named argument style for pass
       ing arguments to the CGI methods using named parameters.
       Recognized parameters are -type, -status, -expires, and
       -cookie.	 Any other named parameters will be stripped of
       their initial hyphens and turned into header fields,
       allowing you to specify any HTTP header you desire.
       Internal underscores will be turned into hyphens:

	   print $query->header(-Content_length=>3002);

       Most browsers will not cache the output from CGI scripts.
       Every time the browser reloads the page, the script is
       invoked anew.  You can change this behavior with the
       -expires parameter.  When you specify an absolute or rela
       tive expiration interval with this parameter, some
       browsers and proxy servers will cache the script's output
       until the indicated expiration date.  The following forms
       are all valid for the -expires field:

	       +30s				 30 seconds from now
	       +10m				 ten minutes from now
	       +1h				 one hour from now
	       -1d				 yesterday (i.e. "ASAP!")
	       now				 immediately
	       +3M				 in three months
	       +10y				 in ten years time
	       Thursday, 25-Apr-1999 00:40:33 GMT  at the indicated time & date

       The -cookie parameter generates a header that tells the
       browser to provide a "magic cookie" during all subsequent
       transactions with your script.  Netscape cookies have a
       special format that includes interesting attributes such
       as expiration time.  Use the cookie() method to create and
       retrieve session cookies.

       The -nph parameter, if set to a true value, will issue the
       correct headers to work with a NPH (no-parse-header)
       script.	This is important to use with certain servers
       that expect all their scripts to be NPH.

       The -charset parameter can be used to control the charac
       ter set sent to the browser.  If not provided, defaults to
       ISO-8859-1.  As a side effect, this sets the charset()
       method as well.

       The -attachment parameter can be used to turn the page
       into an attachment.  Instead of displaying the page, some
       browsers will prompt the user to save it to disk.  The
       value of the argument is the suggested name for the saved
       file.  In order for this to work, you may have to set the
       -type to "application/octet-stream".

       GENERATING A REDIRECTION HEADER

	  print $query->redirect('http://somewhere.else/in/movie/land');

       Sometimes you don't want to produce a document yourself,
       but simply redirect the browser elsewhere, perhaps choos
       ing a URL based on the time of day or the identity of the
       user.

       The redirect() function redirects the browser to a differ
       ent URL.	 If you use redirection like this, you should not
       print out a header as well.

       One hint I can offer is that relative links may not work
       correctly when you generate a redirection to another docu
       ment on your site.  This is due to a well-intentioned
       optimization that some servers use.  The solution to this
       is to use the full URL (including the http: part) of the
       document you are redirecting to.

       You can also use named arguments:

	   print $query->redirect(-uri=>'http://somewhere.else/in/movie/land',
				  -nph=>1);

       The -nph parameter, if set to a true value, will issue the
       correct headers to work with a NPH (no-parse-header)
       script.	This is important to use with certain servers,
       such as Microsoft Internet Explorer, which expect all
       their scripts to be NPH.

       CREATING THE HTML DOCUMENT HEADER

	  print $query->start_html(-title=>'Secrets of the Pyramids',
				   -author=>'fred@capricorn.org',
				   -base=>'true',
				   -target=>'_blank',
				   -meta=>{'keywords'=>'pharaoh secret mummy',
					   'copyright'=>'copyright 1996 King Tut'},
				   -style=>{'src'=>'/styles/style1.css'},
				   -BGCOLOR=>'blue');

       After creating the HTTP header, most CGI scripts will
       start writing out an HTML document.  The start_html() rou
       tine creates the top of the page, along with a lot of
       optional information that controls the page's appearance
       and behavior.

       This method returns a canned HTML header and the opening
       <BODY> tag.  All parameters are optional.  In the named
       parameter form, recognized parameters are -title, -author,
       -base, -xbase, -dtd, -lang and -target (see below for the
       explanation).  Any additional parameters you provide, such
       as the Netscape unofficial BGCOLOR attribute, are added to
       the <BODY> tag.	Additional parameters must be proceeded
       by a hyphen.

       The argument -xbase allows you to provide an HREF for the
       <BASE> tag different from the current location, as in

	   -xbase=>"http://home.mcom.com/"

       All relative links will be interpreted relative to this
       tag.

       The argument -target allows you to provide a default tar
       get frame for all the links and fill-out forms on the
       page.  This is a non-standard HTTP feature which only
       works with Netscape browsers!  See the Netscape documenta
       tion on frames for details of how to manipulate this.

	   -target=>"answer_window"

       All relative links will be interpreted relative to this
       tag.  You add arbitrary meta information to the header
       with the -meta argument.	 This argument expects a refer
       ence to an associative array containing name/value pairs
       of meta information.  These will be turned into a series
       of header <META> tags that look something like this:

	   <META NAME="keywords" CONTENT="pharaoh secret mummy">
	   <META NAME="description" CONTENT="copyright 1996 King Tut">

       To create an HTTP-EQUIV type of <META> tag, use -head,
       described below.

       The -style argument is used to incorporate cascading
       stylesheets into your code.  See the section on CASCADING
       STYLESHEETS for more information.

       The -lang argument is used to incorporate a language
       attribute into the <HTML> tag.  The default if not speci
       fied is "en-US" for US English.	For example:

	   print $q->start_html(-lang=>'fr-CA');

       You can place other arbitrary HTML elements to the <HEAD>
       section with the -head tag.  For example, to place the
       rarely-used <LINK> element in the head section, use this:

	   print start_html(-head=>Link({-rel=>'next',
					 -href=>'http://www.capricorn.com/s2.html'}));

       To incorporate multiple HTML elements into the <HEAD> sec
       tion, just pass an array reference:

	   print start_html(-head=>[
				    Link({-rel=>'next',
					  -href=>'http://www.capricorn.com/s2.html'}),
				    Link({-rel=>'previous',
					  -href=>'http://www.capricorn.com/s1.html'})
				    ]
			    );

       And here's how to create an HTTP-EQUIV <META> tag:

	     print start_html(-head=>meta({-http_equiv => 'Content-Type',
					   -content    => 'text/html'}))

       JAVASCRIPTING: The -script, -noScript, -onLoad,
       -onMouseOver, -onMouseOut and -onUnload parameters are
       used to add Netscape JavaScript calls to your pages.
       -script should point to a block of text containing
       JavaScript function definitions.	 This block will be
       placed within a <SCRIPT> block inside the HTML (not HTTP)
       header.	The block is placed in the header in order to
       give your page a fighting chance of having all its
       JavaScript functions in place even if the user presses the
       stop button before the page has loaded completely.  CGI.pm
       attempts to format the script in such a way that
       JavaScript-naive browsers will not choke on the code:
       unfortunately there are some browsers, such as Chimera for
       Unix, that get confused by it nevertheless.

       The -onLoad and -onUnload parameters point to fragments of
       JavaScript code to execute when the page is respectively
       opened and closed by the browser.  Usually these parame
       ters are calls to functions defined in the -script field:

	     $query = new CGI;
	     print $query->header;
	     $JSCRIPT=<<END;
	     // Ask a silly question
	     function riddle_me_this() {
		var r = prompt("What walks on four legs in the morning, " +
			      "two legs in the afternoon, " +
			      "and three legs in the evening?");
		response(r);
	     }
	     // Get a silly answer
	     function response(answer) {
		if (answer == "man")
		   alert("Right you are!");
		else
		   alert("Wrong!  Guess again.");
	     }
	     END
	     print $query->start_html(-title=>'The Riddle of the Sphinx',
				      -script=>$JSCRIPT);

       Use the -noScript parameter to pass some HTML text that
       will be displayed on browsers that do not have JavaScript
       (or browsers where JavaScript is turned off).

       Netscape 3.0 recognizes several attributes of the <SCRIPT>
       tag, including LANGUAGE and SRC.	 The latter is particu
       larly interesting, as it allows you to keep the JavaScript
       code in a file or CGI script rather than cluttering up
       each page with the source.  To use these attributes pass a
       HASH reference in the -script parameter containing one or
       more of -language, -src, or -code:

	   print $q->start_html(-title=>'The Riddle of the Sphinx',
				-script=>{-language=>'JAVASCRIPT',
					  -src=>'/javascript/sphinx.js'}
				);

	   print $q->(-title=>'The Riddle of the Sphinx',
		      -script=>{-language=>'PERLSCRIPT',
				-code=>'print "hello world!\n;"'}
		      );

       A final feature allows you to incorporate multiple
       <SCRIPT> sections into the header.  Just pass the list of
       script sections as an array reference.  this allows you to
       specify different source files for different dialects of
       JavaScript.  Example:

	    print $q->start_html(-title=>'The Riddle of the Sphinx',
				 -script=>[
					   { -language => 'JavaScript1.0',
					     -src      => '/javascript/utilities10.js'
					   },
					   { -language => 'JavaScript1.1',
					     -src      => '/javascript/utilities11.js'
					   },
					   { -language => 'JavaScript1.2',
					     -src      => '/javascript/utilities12.js'
					   },
					   { -language => 'JavaScript28.2',
					     -src      => '/javascript/utilities219.js'
					   }
					]
				    );
	    </pre>

       If this looks a bit extreme, take my advice and stick with
       straight CGI scripting.

       See

	  http://home.netscape.com/eng/mozilla/2.0/handbook/javascript/

       for more information about JavaScript.

       The old-style positional parameters are as follows:

       Parameters:
       1.  The title

       2.  The author's e-mail address (will create a <LINK
	   REV="MADE"> tag if present

       3.  A 'true' flag if you want to include a <BASE> tag in
	   the header.	This helps resolve relative addresses to
	   absolute ones when the document is moved, but makes
	   the document hierarchy non-portable.	 Use with care!

       4, 5, 6...
	   Any other parameters you want to include in the <BODY>
	   tag.	 This is a good place to put Netscape extensions,
	   such as colors and wallpaper patterns.

       ENDING THE HTML DOCUMENT:

	       print $query->end_html

       This ends an HTML document by printing the </BODY></HTML>
       tags.

       CREATING A SELF-REFERENCING URL THAT PRESERVES STATE
       INFORMATION:

	   $myself = $query->self_url;
	   print q(<A HREF="$myself">I'm talking to myself.</A>);

       self_url() will return a URL, that, when selected, will
       reinvoke this script with all its state information
       intact.	This is most useful when you want to jump around
       within the document using internal anchors but you don't
       want to disrupt the current contents of the form(s).
       Something like this will do the trick.

	    $myself = $query->self_url;
	    print "<A HREF=$myself#table1>See table 1</A>";
	    print "<A HREF=$myself#table2>See table 2</A>";
	    print "<A HREF=$myself#yourself>See for yourself</A>";

       If you want more control over what's returned, using the
       url() method instead.

       You can also retrieve the unprocessed query string with
       query_string():

	   $the_string = $query->query_string;

       OBTAINING THE SCRIPT'S URL

	   $full_url	  = $query->url();
	   $full_url	  = $query->url(-full=>1);  #alternative syntax
	   $relative_url  = $query->url(-relative=>1);
	   $absolute_url  = $query->url(-absolute=>1);
	   $url_with_path = $query->url(-path_info=>1);
	   $url_with_path_and_query = $query->url(-path_info=>1,-query=>1);
	   $netloc	  = $query->url(-base => 1);

       url() returns the script's URL in a variety of formats.
       Called without any arguments, it returns the full form of
       the URL, including host name and port number

	   http://your.host.com/path/to/script.cgi

       You can modify this format with the following named argu
       ments:

       -absolute
	   If true, produce an absolute URL, e.g.

	       /path/to/script.cgi

       -relative
	   Produce a relative URL.  This is useful if you want to
	   reinvoke your script with different parameters. For
	   example:

	       script.cgi

       -full
	   Produce the full URL, exactly as if called without any
	   arguments.  This overrides the -relative and -absolute
	   arguments.

       -path (-path_info)
	   Append the additional path information to the URL.
	   This can be combined with -full, -absolute or -rela
	   tive.  -path_info is provided as a synonym.

       -query (-query_string)
	   Append the query string to the URL.	This can be com
	   bined with -full, -absolute or -relative.
	   -query_string is provided as a synonym.

       -base
	   Generate just the protocol and net location, as in
	   http://www.foo.com:8000

       MIXING POST AND URL PARAMETERS

	  $color = $query->url_param('color');

       It is possible for a script to receive CGI parameters in
       the URL as well as in the fill-out form by creating a form
       that POSTs to a URL containing a query string (a "?" mark
       followed by arguments).	The param() method will always
       return the contents of the POSTed fill-out form, ignoring
       the URL's query string.	To retrieve URL parameters, call
       the url_param() method.	Use it in the same way as
       param().	 The main difference is that it allows you to
       read the parameters, but not set them.

       Under no circumstances will the contents of the URL query
       string interfere with similarly-named CGI parameters in
       POSTed forms.  If you try to mix a URL query string with a
       form submitted with the GET method, the results will not
       be what you expect.

CREATING STANDARD HTML ELEMENTS:
       CGI.pm defines general HTML shortcut methods for most, if
       not all of the HTML 3 and HTML 4 tags.  HTML shortcuts are
       named after a single HTML element and return a fragment of
       HTML text that you can then print or manipulate as you
       like.  Each shortcut returns a fragment of HTML code that
       you can append to a string, save to a file, or, most com
       monly, print out so that it displays in the browser win
       dow.

       This example shows how to use the HTML methods:

	  $q = new CGI;
	  print $q->blockquote(
			    "Many years ago on the island of",
			    $q->a({href=>"http://crete.org/"},"Crete"),
			    "there lived a Minotaur named",
			    $q->strong("Fred."),
			   ),
	      $q->hr;

       This results in the following HTML code (extra newlines
       have been added for readability):

	  <blockquote>
	  Many years ago on the island of
	  <a HREF="http://crete.org/">Crete</a> there lived
	  a minotaur named <strong>Fred.</strong>
	  </blockquote>
	  <hr>

       If you find the syntax for calling the HTML shortcuts awk
       ward, you can import them into your namespace and dispense
       with the object syntax completely (see the next section
       for more details):

	  use CGI ':standard';
	  print blockquote(
	     "Many years ago on the island of",
	     a({href=>"http://crete.org/"},"Crete"),
	     "there lived a minotaur named",
	     strong("Fred."),
	     ),
	     hr;

       PROVIDING ARGUMENTS TO HTML SHORTCUTS

       The HTML methods will accept zero, one or multiple argu
       ments.  If you provide no arguments, you get a single tag:

	  print hr;    #  <HR>

       If you provide one or more string arguments, they are con
       catenated together with spaces and placed between opening
       and closing tags:

	  print h1("Chapter","1"); # <H1>Chapter 1</H1>"

       If the first argument is an associative array reference,
       then the keys and values of the associative array become
       the HTML tag's attributes:

	  print a({-href=>'fred.html',-target=>'_new'},
	     "Open a new frame");

		   <A HREF="fred.html",TARGET="_new">Open a new frame</A>

       You may dispense with the dashes in front of the attribute
       names if you prefer:

	  print img {src=>'fred.gif',align=>'LEFT'};

		  <IMG ALIGN="LEFT" SRC="fred.gif">

       Sometimes an HTML tag attribute has no argument.	 For
       example, ordered lists can be marked as COMPACT.	 The syn
       tax for this is an argument that that points to an undef
       string:

	  print ol({compact=>undef},li('one'),li('two'),li('three'));

       Prior to CGI.pm version 2.41, providing an empty ('')
       string as an attribute argument was the same as providing
       undef.  However, this has changed in order to accommodate
       those who want to create tags of the form <IMG ALT="">.
       The difference is shown in these two pieces of code:

	  CODE			 RESULT
	  img({alt=>undef})	 <IMG ALT>
	  img({alt=>''})	 <IMT ALT="">

       THE DISTRIBUTIVE PROPERTY OF HTML SHORTCUTS

       One of the cool features of the HTML shortcuts is that
       they are distributive.  If you give them an argument con
       sisting of a reference to a list, the tag will be dis
       tributed across each element of the list.  For example,
       here's one way to make an ordered list:

	  print ul(
		    li({-type=>'disc'},['Sneezy','Doc','Sleepy','Happy'])
		  );

       This example will result in HTML output that looks like
       this:

	  <UL>
	    <LI TYPE="disc">Sneezy</LI>
	    <LI TYPE="disc">Doc</LI>
	    <LI TYPE="disc">Sleepy</LI>
	    <LI TYPE="disc">Happy</LI>
	  </UL>

       This is extremely useful for creating tables.  For exam
       ple:

	  print table({-border=>undef},
		  caption('When Should You Eat Your Vegetables?'),
		  Tr({-align=>CENTER,-valign=>TOP},
		  [
		     th(['Vegetable', 'Breakfast','Lunch','Dinner']),
		     td(['Tomatoes' , 'no', 'yes', 'yes']),
		     td(['Broccoli' , 'no', 'no',  'yes']),
		     td(['Onions'   , 'yes','yes', 'yes'])
		  ]
		  )
	       );

       HTML SHORTCUTS AND LIST INTERPOLATION

       Consider this bit of code:

	  print blockquote(em('Hi'),'mom!'));

       It will ordinarily return the string that you probably
       expect, namely:

	  <BLOCKQUOTE><EM>Hi</EM> mom!</BLOCKQUOTE>

       Note the space between the element "Hi" and the element
       "mom!".	CGI.pm puts the extra space there using array
       interpolation, which is controlled by the magic $" vari
       able.  Sometimes this extra space is not what you want,
       for example, when you are trying to align a series of
       images.	In this case, you can simply change the value of
       $" to an empty string.

	  {
	     local($") = '';
	     print blockquote(em('Hi'),'mom!'));
	   }

       I suggest you put the code in a block as shown here.  Oth
       erwise the change to $" will affect all subsequent code
       until you explicitly reset it.

       NON-STANDARD HTML SHORTCUTS

       A few HTML tags don't follow the standard pattern for var
       ious reasons.

       comment() generates an HTML comment (<!-- comment -->).
       Call it like

	   print comment('here is my comment');

       Because of conflicts with built-in Perl functions, the
       following functions begin with initial caps:

	   Select
	   Tr
	   Link
	   Delete
	   Accept
	   Sub

       In addition, start_html(), end_html(), start_form(),
       end_form(), start_multipart_form() and all the fill-out
       form tags are special.  See their respective sections.

       AUTOESCAPING HTML

       By default, all HTML that is emitted by the form-generat
       ing functions is passed through a function called escape_
       HTML():

       $escaped_string = escapeHTML(""unescaped string"");
	   Escape HTML formatting characters in a string.

       Provided that you have specified a character set of
       ISO-8859-1 (the default), the standard HTML escaping rules
       will be used.  The "<" character becomes "<", ">"
       becomes ">", "&" becomes "&", and the quote charac
       ter becomes """.  In addition, the hexadecimal 0x8b
       and 0x9b characters, which many windows-based browsers
       interpret as the left and right angle-bracket characters,
       are replaced by their numeric HTML entities ("‹" and
       "›").  If you manually change the charset, either by
       calling the charset() method explicitly or by passing a
       -charset argument to header(), then all characters will be
       replaced by their numeric entities, since CGI.pm has no
       lookup table for all the possible encodings.

       The automatic escaping does not apply to other shortcuts,
       such as h1().  You should call escapeHTML() yourself on
       untrusted data in order to protect your pages against
       nasty tricks that people may enter into guestbooks, etc..
       To change the character set, use charset().  To turn
       autoescaping off completely, use autoescape():

       $charset = charset([$charset]);
	   Get or set the current character set.

       $flag = autoEscape([$flag]);
	   Get or set the value of the autoescape flag.

       PRETTY-PRINTING HTML

       By default, all the HTML produced by these functions comes
       out as one long line without carriage returns or indenta
       tion. This is yuck, but it does reduce the size of the
       documents by 10-20%.  To get pretty-printed output, please
       use the CGI::Pretty manpage, a subclass contributed by
       Brian Paulsen.

CREATING FILL-OUT FORMS:
       General note  The various form-creating methods all return
       strings to the caller, containing the tag or tags that
       will create the requested form element.	You are responsi
       ble for actually printing out these strings.  It's set up
       this way so that you can place formatting tags around the
       form elements.

       Another note The default values that you specify for the
       forms are only used the first time the script is invoked
       (when there is no query string).	 On subsequent invoca
       tions of the script (when there is a query string), the
       former values are used even if they are blank.

       If you want to change the value of a field from its previ
       ous value, you have two choices:

       (1) call the param() method to set it.

       (2) use the -override (alias -force) parameter (a new fea
       ture in version 2.15).  This forces the default value to
       be used, regardless of the previous value:

	  print $query->textfield(-name=>'field_name',
				  -default=>'starting value',
				  -override=>1,
				  -size=>50,
				  -maxlength=>80);

       Yet another note By default, the text and labels of form
       elements are escaped according to HTML rules.  This means
       that you can safely use "<CLICK ME>" as the label for a
       button.	However, it also interferes with your ability to
       incorporate special HTML character sequences, such as
       Á, into your fields.  If you wish to turn off auto
       matic escaping, call the autoEscape() method with a false
       value immediately after creating the CGI object:

	  $query = new CGI;
	  $query->autoEscape(undef);

       CREATING AN ISINDEX TAG

	  print $query->isindex(-action=>$action);

		-or-

	  print $query->isindex($action);

       Prints out an <ISINDEX> tag.  Not very exciting.	 The
       parameter -action specifies the URL of the script to pro
       cess the query.	The default is to process the query with
       the current script.

       STARTING AND ENDING A FORM

	   print $query->start_form(-method=>$method,
				   -action=>$action,
				   -enctype=>$encoding);
	     <... various form stuff ...>
	   print $query->endform;

	       -or-

	   print $query->start_form($method,$action,$encoding);
	     <... various form stuff ...>
	   print $query->endform;

       start_form() will return a <FORM> tag with the optional
       method, action and form encoding that you specify.  The
       defaults are:

	   method: POST
	   action: this script
	   enctype: application/x-www-form-urlencoded

       endform() returns the closing </FORM> tag.

       Start_form()'s enctype argument tells the browser how to
       package the various fields of the form before sending the
       form to the server.  Two values are possible:

       Note: This method was previously named startform(), and
       startform() is still recognized as an alias.

       application/x-www-form-urlencoded
	   This is the older type of encoding used by all
	   browsers prior to Netscape 2.0.  It is compatible with
	   many CGI scripts and is suitable for short fields con
	   taining text data.  For your convenience, CGI.pm
	   stores the name of this encoding type in
	   &CGI::URL_ENCODED.

       multipart/form-data
	   This is the newer type of encoding introduced by
	   Netscape 2.0.  It is suitable for forms that contain
	   very large fields or that are intended for transfer
	   ring binary data.  Most importantly, it enables the
	   "file upload" feature of Netscape 2.0 forms.	 For your
	   convenience, CGI.pm stores the name of this encoding
	   type in &CGI::MULTIPART

	   Forms that use this type of encoding are not easily
	   interpreted by CGI scripts unless they use CGI.pm or
	   another library designed to handle them.

       For compatibility, the start_form() method uses the older
       form of encoding by default.  If you want to use the newer
       form of encoding by default, you can call start_multi_
       part_form() instead of start_form().

       JAVASCRIPTING: The -name and -onSubmit parameters are pro
       vided for use with JavaScript.  The -name parameter gives
       the form a name so that it can be identified and manipu
       lated by JavaScript functions.  -onSubmit should point to
       a JavaScript function that will be executed just before
       the form is submitted to your server.  You can use this
       opportunity to check the contents of the form for consis
       tency and completeness.	If you find something wrong, you
       can put up an alert box or maybe fix things up yourself.
       You can abort the submission by returning false from this
       function.

       Usually the bulk of JavaScript functions are defined in a
       <SCRIPT> block in the HTML header and -onSubmit points to
       one of these function call.  See start_html() for details.

       CREATING A TEXT FIELD

	   print $query->textfield(-name=>'field_name',
				   -default=>'starting value',
				   -size=>50,
				   -maxlength=>80);
	       -or-

	   print $query->textfield('field_name','starting value',50,80);

       textfield() will return a text input field.

       Parameters
       1.  The first parameter is the required name for the field
	   (-name).

       2.  The optional second parameter is the default starting
	   value for the field contents (-default).

       3.  The optional third parameter is the size of the field
	   in
		 characters (-size).

       4.  The optional fourth parameter is the maximum number of
	   characters the
		 field will accept (-maxlength).

       As with all these methods, the field will be initialized
       with its previous contents from earlier invocations of the
       script.	When the form is processed, the value of the text
       field can be retrieved with:

	      $value = $query->param('foo');

       If you want to reset it from its initial value after the
       script has been called once, you can do so like this:

	      $query->param('foo',"I'm taking over this value!");

       NEW AS OF VERSION 2.15: If you don't want the field to
       take on its previous value, you can force its current
       value by using the -override (alias -force) parameter:

	   print $query->textfield(-name=>'field_name',
				   -default=>'starting value',
				   -override=>1,
				   -size=>50,
				   -maxlength=>80);

       JAVASCRIPTING: You can also provide -onChange, -onFocus,
       -onBlur, -onMouseOver, -onMouseOut and -onSelect parame
       ters to register JavaScript event handlers.  The onChange
       handler will be called whenever the user changes the con
       tents of the text field.	 You can do text validation if
       you like.  onFocus and onBlur are called respectively when
       the insertion point moves into and out of the text field.
       onSelect is called when the user changes the portion of
       the text that is selected.

       CREATING A BIG TEXT FIELD

	  print $query->textarea(-name=>'foo',
				 -default=>'starting value',
				 -rows=>10,
				 -columns=>50);

	       -or

	  print $query->textarea('foo','starting value',10,50);

       textarea() is just like textfield, but it allows you to
       specify rows and columns for a multiline text entry box.
       You can provide a starting value for the field, which can
       be long and contain multiple lines.

       JAVASCRIPTING: The -onChange, -onFocus, -onBlur ,
       -onMouseOver, -onMouseOut, and -onSelect parameters are
       recognized.  See textfield().

       CREATING A PASSWORD FIELD

	  print $query->password_field(-name=>'secret',
				       -value=>'starting value',
				       -size=>50,
				       -maxlength=>80);
	       -or-

	  print $query->password_field('secret','starting value',50,80);

       password_field() is identical to textfield(), except that
       its contents will be starred out on the web page.

       JAVASCRIPTING: The -onChange, -onFocus, -onBlur,
       -onMouseOver, -onMouseOut and -onSelect parameters are
       recognized.  See textfield().

       CREATING A FILE UPLOAD FIELD

	   print $query->filefield(-name=>'uploaded_file',
				   -default=>'starting value',
				   -size=>50,
				   -maxlength=>80);
	       -or-

	   print $query->filefield('uploaded_file','starting value',50,80);

       filefield() will return a file upload field for Netscape
       2.0 browsers.  In order to take full advantage of this you
       must use the new multipart encoding scheme for the form.
       You can do this either by calling start_form() with an
       encoding type of &CGI::MULTIPART, or by calling the new
       method start_multipart_form() instead of vanilla
       start_form().

       Parameters
       1.  The first parameter is the required name for the field
	   (-name).

       2.  The optional second parameter is the starting value
	   for the field contents to be used as the default file
	   name (-default).

	   For security reasons, browsers don't pay any attention
	   to this field, and so the starting value will always
	   be blank.  Worse, the field loses its "sticky" behav
	   ior and forgets its previous contents.  The starting
	   value field is called for in the HTML specification,
	   however, and possibly some browser will eventually
	   provide support for it.

       3.  The optional third parameter is the size of the field
	   in characters (-size).

       4.  The optional fourth parameter is the maximum number of
	   characters the field will accept (-maxlength).

       When the form is processed, you can retrieve the entered
       filename by calling param():

	      $filename = $query->param('uploaded_file');

       Different browsers will return slightly different things
       for the name.  Some browsers return the filename only.
       Others return the full path to the file, using the path
       conventions of the user's machine.  Regardless, the name
       returned is always the name of the file on the user's
       machine, and is unrelated to the name of the temporary
       file that CGI.pm creates during upload spooling (see
       below).

       The filename returned is also a file handle.  You can read
       the contents of the file using standard Perl file reading
       calls:

	       # Read a text file and print it out
	       while (<$filename>) {
		  print;
	       }

	       # Copy a binary file to somewhere safe
	       open (OUTFILE,">>/usr/local/web/users/feedback");
	       while ($bytesread=read($filename,$buffer,1024)) {
		  print OUTFILE $buffer;
	       }

       However, there are problems with the dual nature of the
       upload fields.  If you "use strict", then Perl will com
       plain when you try to use a string as a filehandle.  You
       can get around this by placing the file reading code in a
       block containing the "no strict" pragma.	 More seriously,
       it is possible for the remote user to type garbage into
       the upload field, in which case what you get from param()
       is not a filehandle at all, but a string.

       To be safe, use the upload() function (new in version
       2.47).  When called with the name of an upload field,
       upload() returns a filehandle, or undef if the parameter
       is not a valid filehandle.

	    $fh = $query->upload('uploaded_file');
	    while (<$fh>) {
		  print;
	    }

       This is the recommended idiom.

       When a file is uploaded the browser usually sends along
       some information along with it in the format of headers.
       The information usually includes the MIME content type.
       Future browsers may send other information as well (such
       as modification date and size). To retrieve this informa
       tion, call uploadInfo().	 It returns a reference to an
       associative array containing all the document headers.

	      $filename = $query->param('uploaded_file');
	      $type = $query->uploadInfo($filename)->{'Content-Type'};
	      unless ($type eq 'text/html') {
		 die "HTML FILES ONLY!";
	      }

       If you are using a machine that recognizes "text" and
       "binary" data modes, be sure to understand when and how to
       use them (see the Camel book).  Otherwise you may find
       that binary files are corrupted during file uploads.

       There are occasionally problems involving parsing the
       uploaded file.  This usually happens when the user presses
       "Stop" before the upload is finished.  In this case,
       CGI.pm will return undef for the name of the uploaded file
       and set cgi_error() to the string "400 Bad request (mal
       formed multipart POST)".	 This error message is designed
       so that you can incorporate it into a status code to be
       sent to the browser.  Example:

	  $file = $query->upload('uploaded_file');
	  if (!$file && $query->cgi_error) {
	     print $query->header(-status=>$query->cgi_error);
	     exit 0;
	  }

       You are free to create a custom HTML page to complain
       about the error, if you wish.

       JAVASCRIPTING: The -onChange, -onFocus, -onBlur,
       -onMouseOver, -onMouseOut and -onSelect parameters are
       recognized.  See textfield() for details.

       CREATING A POPUP MENU

	  print $query->popup_menu('menu_name',
				   ['eenie','meenie','minie'],
				   'meenie');

	     -or-

	  %labels = ('eenie'=>'your first choice',
		     'meenie'=>'your second choice',
		     'minie'=>'your third choice');
	  print $query->popup_menu('menu_name',
				   ['eenie','meenie','minie'],
				   'meenie',\%labels);

	       -or (named parameter style)-

	  print $query->popup_menu(-name=>'menu_name',
				   -values=>['eenie','meenie','minie'],
				   -default=>'meenie',
				   -labels=>\%labels);

       popup_menu() creates a menu.

       1.  The required first argument is the menu's name
	   (-name).

       2.  The required second argument (-values) is an array
	   reference containing the list of menu items in the
	   menu.  You can pass the method an anonymous array, as
	   shown in the example, or a reference to a named array,
	   such as "\@foo".

       3.  The optional third parameter (-default) is the name of
	   the default menu choice.  If not specified, the first
	   item will be the default.  The values of the previous
	   choice will be maintained across queries.

       4.  The optional fourth parameter (-labels) is provided
	   for people who want to use different values for the
	   user-visible label inside the popup menu nd the value
	   returned to your script.  It's a pointer to an asso
	   ciative array relating menu values to user-visible
	   labels.  If you leave this parameter blank, the menu
	   values will be displayed by default.	 (You can also
	   leave a label undefined if you want to).

       When the form is processed, the selected value of the
       popup menu can be retrieved using:

	     $popup_menu_value = $query->param('menu_name');

       JAVASCRIPTING: popup_menu() recognizes the following event
       handlers: -onChange, -onFocus, -onMouseOver, -onMouseOut,
       and -onBlur.  See the textfield() section for details on
       when these handlers are called.

       CREATING A SCROLLING LIST

	  print $query->scrolling_list('list_name',
				       ['eenie','meenie','minie','moe'],
				       ['eenie','moe'],5,'true');
	     -or-

	  print $query->scrolling_list('list_name',
				       ['eenie','meenie','minie','moe'],
				       ['eenie','moe'],5,'true',
				       \%labels);

	       -or-

	  print $query->scrolling_list(-name=>'list_name',
				       -values=>['eenie','meenie','minie','moe'],
				       -default=>['eenie','moe'],
				       -size=>5,
				       -multiple=>'true',
				       -labels=>\%labels);

       scrolling_list() creates a scrolling list.

       Parameters:
       1.  The first and second arguments are the list name
	   (-name) and values (-values).  As in the popup menu,
	   the second argument should be an array reference.

       2.  The optional third argument (-default) can be either a
	   reference to a list containing the values to be
	   selected by default, or can be a single value to
	   select.  If this argument is missing or undefined,
	   then nothing is selected when the list first appears.
	   In the named parameter version, you can use the syn
	   onym "-defaults" for this parameter.

       3.  The optional fourth argument is the size of the list
	   (-size).

       4.  The optional fifth argument can be set to true to
	   allow multiple simultaneous selections (-multiple).
	   Otherwise only one selection will be allowed at a
	   time.

       5.  The optional sixth argument is a pointer to an asso
	   ciative array containing long user-visible labels for
	   the list items (-labels).  If not provided, the values
	   will be displayed.

	   When this form is processed, all selected list items
	   will be returned as a list under the parameter name
	   'list_name'.	 The values of the selected items can be
	   retrieved with:

		 @selected = $query->param('list_name');

       JAVASCRIPTING: scrolling_list() recognizes the following
       event handlers: -onChange, -onFocus, -onMouseOver,
       -onMouseOut and -onBlur.	 See textfield() for the descrip
       tion of when these handlers are called.

       CREATING A GROUP OF RELATED CHECKBOXES

	  print $query->checkbox_group(-name=>'group_name',
				       -values=>['eenie','meenie','minie','moe'],
				       -default=>['eenie','moe'],
				       -linebreak=>'true',
				       -labels=>\%labels);

	  print $query->checkbox_group('group_name',
				       ['eenie','meenie','minie','moe'],
				       ['eenie','moe'],'true',\%labels);

	  HTML3-COMPATIBLE BROWSERS ONLY:

	  print $query->checkbox_group(-name=>'group_name',
				       -values=>['eenie','meenie','minie','moe'],
				       -rows=2,-columns=>2);

       checkbox_group() creates a list of checkboxes that are
       related by the same name.

       Parameters:
       1.  The first and second arguments are the checkbox name
	   and values, respectively (-name and -values).  As in
	   the popup menu, the second argument should be an array
	   reference.  These values are used for the user-read
	   able labels printed next to the checkboxes as well as
	   for the values passed to your script in the query
	   string.

       2.  The optional third argument (-default) can be either a
	   reference to a list containing the values to be
	   checked by default, or can be a single value to
	   checked.  If this argument is missing or undefined,
	   then nothing is selected when the list first appears.

       3.  The optional fourth argument (-linebreak) can be set
	   to true to place line breaks between the checkboxes so
	   that they appear as a vertical list.	 Otherwise, they
	   will be strung together on a horizontal line.

       4.  The optional fifth argument is a pointer to an asso
	   ciative array relating the checkbox values to the
	   user-visible labels that will be printed next to them
	   (-labels).  If not provided, the values will be used
	   as the default.

       5.  HTML3-compatible browsers (such as Netscape) can take
	   advantage of the optional parameters -rows, and
	   -columns.  These parameters cause checkbox_group() to
	   return an HTML3 compatible table containing the check
	   box group formatted with the specified number of rows
	   and columns.	 You can provide just the -columns param
	   eter if you wish; checkbox_group will calculate the
	   correct number of rows for you.

	   To include row and column headings in the returned
	   table, you can use the -rowheaders and -colheaders
	   parameters.	Both of these accept a pointer to an
	   array of headings to use.  The headings are just deco
	   rative.  They don't reorganize the interpretation of
	   the checkboxes -- they're still a single named unit.

       When the form is processed, all checked boxes will be
       returned as a list under the parameter name 'group_name'.
       The values of the "on" checkboxes can be retrieved with:

	     @turned_on = $query->param('group_name');

       The value returned by checkbox_group() is actually an
       array of button elements.  You can capture them and use
       them within tables, lists, or in other creative ways:

	   @h = $query->checkbox_group(-name=>'group_name',-values=>\@values);
	   &use_in_creative_way(@h);

       JAVASCRIPTING: checkbox_group() recognizes the -onClick
       parameter.  This specifies a JavaScript code fragment or
       function call to be executed every time the user clicks on
       any of the buttons in the group.	 You can retrieve the
       identity of the particular button clicked on using the
       "this" variable.

       CREATING A STANDALONE CHECKBOX

	   print $query->checkbox(-name=>'checkbox_name',
				  -checked=>'checked',
				  -value=>'ON',
				  -label=>'CLICK ME');

	       -or-

	   print $query->checkbox('checkbox_name','checked','ON','CLICK ME');

       checkbox() is used to create an isolated checkbox that
       isn't logically related to any others.

       Parameters:
       1.  The first parameter is the required name for the
	   checkbox (-name).  It will also be used for the user-
	   readable label printed next to the checkbox.

       2.  The optional second parameter (-checked) specifies
	   that the checkbox is turned on by default.  Synonyms
	   are -selected and -on.

       3.  The optional third parameter (-value) specifies the
	   value of the checkbox when it is checked.  If not pro
	   vided, the word "on" is assumed.

       4.  The optional fourth parameter (-label) is the user-
	   readable label to be attached to the checkbox.  If not
	   provided, the checkbox name is used.

       The value of the checkbox can be retrieved using:

	   $turned_on = $query->param('checkbox_name');

       JAVASCRIPTING: checkbox() recognizes the -onClick parame
       ter.  See checkbox_group() for further details.

       CREATING A RADIO BUTTON GROUP

	  print $query->radio_group(-name=>'group_name',
				    -values=>['eenie','meenie','minie'],
				    -default=>'meenie',
				    -linebreak=>'true',
				    -labels=>\%labels);

	       -or-

	  print $query->radio_group('group_name',['eenie','meenie','minie'],
						 'meenie','true',\%labels);

	  HTML3-COMPATIBLE BROWSERS ONLY:

	  print $query->radio_group(-name=>'group_name',
				    -values=>['eenie','meenie','minie','moe'],
				    -rows=2,-columns=>2);

       radio_group() creates a set of logically-related radio
       buttons (turning one member of the group on turns the oth
       ers off)

       Parameters:
       1.  The first argument is the name of the group and is
	   required (-name).

       2.  The second argument (-values) is the list of values
	   for the radio buttons.  The values and the labels that
	   appear on the page are identical.  Pass an array ref_
	   erence in the second argument, either using an anony
	   mous array, as shown, or by referencing a named array
	   as in "\@foo".

       3.  The optional third parameter (-default) is the name of
	   the default button to turn on. If not specified, the
	   first item will be the default.  You can provide a
	   nonexistent button name, such as "-" to start up with
	   no buttons selected.

       4.  The optional fourth parameter (-linebreak) can be set
	   to 'true' to put line breaks between the buttons, cre
	   ating a vertical list.

       5.  The optional fifth parameter (-labels) is a pointer to
	   an associative array relating the radio button values
	   to user-visible labels to be used in the display.  If
	   not provided, the values themselves are displayed.

       6.  HTML3-compatible browsers (such as Netscape) can take
	   advantage of the optional parameters -rows, and
	   -columns.  These parameters cause radio_group() to
	   return an HTML3 compatible table containing the radio
	   group formatted with the specified number of rows and
	   columns.  You can provide just the -columns parameter
	   if you wish; radio_group will calculate the correct
	   number of rows for you.

	   To include row and column headings in the returned
	   table, you can use the -rowheader and -colheader
	   parameters.	Both of these accept a pointer to an
	   array of headings to use.  The headings are just deco
	   rative.  They don't reorganize the interpretation of
	   the radio buttons -- they're still a single named
	   unit.

       When the form is processed, the selected radio button can
       be retrieved using:

	     $which_radio_button = $query->param('group_name');

       The value returned by radio_group() is actually an array
       of button elements.  You can capture them and use them
       within tables, lists, or in other creative ways:

	   @h = $query->radio_group(-name=>'group_name',-values=>\@values);
	   &use_in_creative_way(@h);

       CREATING A SUBMIT BUTTON

	  print $query->submit(-name=>'button_name',
			       -value=>'value');

	       -or-

	  print $query->submit('button_name','value');

       submit() will create the query submission button.  Every
       form should have one of these.

       Parameters:
       1.  The first argument (-name) is optional.  You can give
	   the button a name if you have several submission but
	   tons in your form and you want to distinguish between
	   them.  The name will also be used as the user-visible
	   label.  Be aware that a few older browsers don't deal
	   with this correctly and never send back a value from a
	   button.

       2.  The second argument (-value) is also optional.  This
	   gives the button a value that will be passed to your
	   script in the query string.

       You can figure out which button was pressed by using dif
       ferent values for each one:

	    $which_one = $query->param('button_name');

       JAVASCRIPTING: radio_group() recognizes the -onClick
       parameter.  See checkbox_group() for further details.

       CREATING A RESET BUTTON

	  print $query->reset

       reset() creates the "reset" button.  Note that it restores
       the form to its value from the last time the script was
       called, NOT necessarily to the defaults.

       Note that this conflicts with the Perl reset() built-in.
       Use CORE:\fIs0:reset() to get the original reset function.

       CREATING A DEFAULT BUTTON

	  print $query->defaults('button_label')

       defaults() creates a button that, when invoked, will cause
       the form to be completely reset to its defaults, wiping
       out all the changes the user ever made.

       CREATING A HIDDEN FIELD

	       print $query->hidden(-name=>'hidden_name',
				    -default=>['value1','value2'...]);

		       -or-

	       print $query->hidden('hidden_name','value1','value2'...);

       hidden() produces a text field that can't be seen by the
       user.  It is useful for passing state variable information
       from one invocation of the script to the next.

       Parameters:
       1.  The first argument is required and specifies the name
	   of this field (-name).

       2.  The second argument is also required and specifies its
	   value (-default).  In the named parameter style of
	   calling, you can provide a single value here or a ref
	   erence to a whole list

       Fetch the value of a hidden field this way:

	    $hidden_value = $query->param('hidden_name');

       Note, that just like all the other form elements, the
       value of a hidden field is "sticky".  If you want to
       replace a hidden field with some other values after the
       script has been called once you'll have to do it manually:

	    $query->param('hidden_name','new','values','here');

       CREATING A CLICKABLE IMAGE BUTTON

	    print $query->image_button(-name=>'button_name',
				       -src=>'/source/URL',
				       -align=>'MIDDLE');

	       -or-

	    print $query->image_button('button_name','/source/URL','MIDDLE');

       image_button() produces a clickable image.  When it's
       clicked on the position of the click is returned to your
       script as "button_name.x" and "button_name.y", where "but
       ton_name" is the name you've assigned to it.

       JAVASCRIPTING: image_button() recognizes the -onClick
       parameter.  See checkbox_group() for further details.

       Parameters:
       1.  The first argument (-name) is required and specifies
	   the name of this field.

       2.  The second argument (-src) is also required and speci
	   fies the URL

       3.  The third option (-align, optional) is an alignment
	   type, and may be TOP, BOTTOM or MIDDLE

       Fetch the value of the button this way:
	    $x = $query->param('button_name.x');
	    $y = $query->param('button_name.y');

       CREATING A JAVASCRIPT ACTION BUTTON

	    print $query->button(-name=>'button_name',
				 -value=>'user visible label',
				 -onClick=>"do_something()");

	       -or-

	    print $query->button('button_name',"do_something()");

       button() produces a button that is compatible with
       Netscape 2.0's JavaScript.  When it's pressed the fragment
       of JavaScript code pointed to by the -onClick parameter
       will be executed.  On non-Netscape browsers this form ele
       ment will probably not even display.

HTTP COOKIES
       Netscape browsers versions 1.1 and higher, and all ver
       sions of Internet Explorer, support a so-called "cookie"
       designed to help maintain state within a browser session.
       CGI.pm has several methods that support cookies.

       A cookie is a name=value pair much like the named parame
       ters in a CGI query string.  CGI scripts create one or
       more cookies and send them to the browser in the HTTP
       header.	The browser maintains a list of cookies that
       belong to a particular Web server, and returns them to the
       CGI script during subsequent interactions.

       In addition to the required name=value pair, each cookie
       has several optional attributes:

       1. an expiration time
	   This is a time/date string (in a special GMT format)
	   that indicates when a cookie expires.  The cookie will
	   be saved and returned to your script until this expi
	   ration date is reached if the user exits the browser
	   and restarts it.  If an expiration date isn't speci
	   fied, the cookie will remain active until the user
	   quits the browser.

       2. a domain
	   This is a partial or complete domain name for which
	   the cookie is valid.	 The browser will return the
	   cookie to any host that matches the partial domain
	   name.  For example, if you specify a domain name of
	   ".capricorn.com", then the browser will return the
	   cookie to Web servers running on any of the machines
	   "www.capricorn.com", "www2.capricorn.com", "feck
	   less.capricorn.com", etc.  Domain names must contain
	   at least two periods to prevent attempts to match on
	   top level domains like ".edu".  If no domain is speci
	   fied, then the browser will only return the cookie to
	   servers on the host the cookie originated from.

       3. a path
	   If you provide a cookie path attribute, the browser
	   will check it against your script's URL before return
	   ing the cookie.  For example, if you specify the path
	   "/cgi-bin", then the cookie will be returned to each
	   of the scripts "/cgi-bin/tally.pl", "/cgi-
	   bin/order.pl", and "/cgi-bin/customer_service/com
	   plain.pl", but not to the script "/cgi-pri
	   vate/site_admin.pl".	 By default, path is set to "/",
	   which causes the cookie to be sent to any CGI script
	   on your site.

       4. a ""secure"" flag
	   If the "secure" attribute is set, the cookie will only
	   be sent to your script if the CGI request is occurring
	   on a secure channel, such as SSL.

       The interface to HTTP cookies is the cookie() method:

	   $cookie = $query->cookie(-name=>'sessionID',
				    -value=>'xyzzy',
				    -expires=>'+1h',
				    -path=>'/cgi-bin/database',
				    -domain=>'.capricorn.org',
				    -secure=>1);
	   print $query->header(-cookie=>$cookie);

       cookie() creates a new cookie.  Its parameters include:

       -name
	   The name of the cookie (required).  This can be any
	   string at all.  Although browsers limit their cookie
	   names to non-whitespace alphanumeric characters,
	   CGI.pm removes this restriction by escaping and
	   unescaping cookies behind the scenes.

       -value
	   The value of the cookie.  This can be any scalar
	   value, array reference, or even associative array ref
	   erence.  For example, you can store an entire associa
	   tive array into a cookie this way:

		   $cookie=$query->cookie(-name=>'family information',
					  -value=>\%childrens_ages);

       -path
	   The optional partial path for which this cookie will
	   be valid, as described above.

       -domain
	   The optional partial domain for which this cookie will
	   be valid, as described above.

       -expires
	   The optional expiration date for this cookie.  The
	   format is as described in the section on the header()
	   method:

		   "+1h"  one hour from now

       -secure
	   If set to true, this cookie will only be used within a
	   secure SSL session.

       The cookie created by cookie() must be incorporated into
       the HTTP header within the string returned by the header()
       method:

	       print $query->header(-cookie=>$my_cookie);

       To create multiple cookies, give header() an array refer
       ence:

	       $cookie1 = $query->cookie(-name=>'riddle_name',
					 -value=>"The Sphynx's Question");
	       $cookie2 = $query->cookie(-name=>'answers',
					 -value=>\%answers);
	       print $query->header(-cookie=>[$cookie1,$cookie2]);

       To retrieve a cookie, request it by name by calling
       cookie() method without the -value parameter:

	       use CGI;
	       $query = new CGI;
	       $riddle = $query->cookie('riddle_name');
	       %answers = $query->cookie('answers');

       Cookies created with a single scalar value, such as the
       "riddle_name" cookie, will be returned in that form.
       Cookies with array and hash values can also be retrieved.

       The cookie and CGI namespaces are separate.  If you have a
       parameter named 'answers' and a cookie named 'answers',
       the values retrieved by param() and cookie() are indepen
       dent of each other.  However, it's simple to turn a CGI
       parameter into a cookie, and vice-versa:

	  # turn a CGI parameter into a cookie
	  $c=$q->cookie(-name=>'answers',-value=>[$q->param('answers')]);
	  # vice-versa
	  $q->param(-name=>'answers',-value=>[$q->cookie('answers')]);

       See the cookie.cgi example script for some ideas on how to
       use cookies effectively.

WORKING WITH FRAMES
       It's possible for CGI.pm scripts to write into several
       browser panels and windows using the HTML 4 frame mecha
       nism.  There are three techniques for defining new frames
       programmatically:

       1. Create a <Frameset> document
	   After writing out the HTTP header, instead of creating
	   a standard HTML document using the start_html() call,
	   create a <FRAMESET> document that defines the frames
	   on the page.	 Specify your script(s) (with appropriate
	   parameters) as the SRC for each of the frames.

	   There is no specific support for creating <FRAMESET>
	   sections in CGI.pm, but the HTML is very simple to
	   write.  See the frame documentation in Netscape's home
	   pages for details

	     http://home.netscape.com/assist/net_sites/frames.html

       2. Specify the destination for the document in the HTTP
       header
	   You may provide a -target parameter to the header()
	   method:

	       print $q->header(-target=>'ResultsWindow');

	   This will tell the browser to load the output of your
	   script into the frame named "ResultsWindow".	 If a
	   frame of that name doesn't already exist, the browser
	   will pop up a new window and load your script's docu
	   ment into that.  There are a number of magic names
	   that you can use for targets.  See the frame documents
	   on Netscape's home pages for details.

       3. Specify the destination for the document in the <FORM>
       tag
	   You can specify the frame to load in the FORM tag
	   itself.  With CGI.pm it looks like this:

	       print $q->start_form(-target=>'ResultsWindow');

	   When your script is reinvoked by the form, its output
	   will be loaded into the frame named "ResultsWindow".
	   If one doesn't already exist a new window will be cre
	   ated.

       The script "frameset.cgi" in the examples directory shows
       one way to create pages in which the fill-out form and the
       response live in side-by-side frames.

LIMITED SUPPORT FOR CASCADING STYLE SHEETS
       CGI.pm has limited support for HTML3's cascading style
       sheets (css).  To incorporate a stylesheet into your docu
       ment, pass the start_html() method a -style parameter.
       The value of this parameter may be a scalar, in which case
       it is incorporated directly into a <STYLE> section, or it
       may be a hash reference.	 In the latter case you should
       provide the hash with one or more of -src or -code.  -src
       points to a URL where an externally-defined stylesheet can
       be found.  -code points to a scalar value to be incorpo
       rated into a <STYLE> section.  Style definitions in -code
       override similarly-named ones in -src, hence the name
       "cascading."

       You may also specify the type of the stylesheet by adding
       the optional -type parameter to the hash pointed to by
       -style.	If not specified, the style defaults to
       'text/css'.

       To refer to a style within the body of your document, add
       the -class parameter to any HTML element:

	   print h1({-class=>'Fancy'},'Welcome to the Party');

       Or define styles on the fly with the -style parameter:

	   print h1({-style=>'Color: red;'},'Welcome to Hell');

       You may also use the new span() element to apply a style
       to a section of text:

	   print span({-style=>'Color: red;'},
		      h1('Welcome to Hell'),
		      "Where did that handbasket get to?"
		      );

       Note that you must import the ":html3" definitions to have
       the span() method available.  Here's a quick and dirty
       example of using CSS's.	See the CSS specification at
       http://www.w3.org/pub/WWW/TR/Wd-css-1.html for more infor
       mation.

	   use CGI qw/:standard :html3/;

	   #here's a stylesheet incorporated directly into the page
	   $newStyle=<<END;
	   <!--
	   P.Tip {
	       margin-right: 50pt;
	       margin-left: 50pt;
	       color: red;
	   }
	   P.Alert {
	       font-size: 30pt;
	       font-family: sans-serif;
	     color: red;
	   }
	   -->
	   END
	   print header();
	   print start_html( -title=>'CGI with Style',
			     -style=>{-src=>'http://www.capricorn.com/style/st1.css',
				      -code=>$newStyle}
			    );
	   print h1('CGI with Style'),
		 p({-class=>'Tip'},
		   "Better read the cascading style sheet spec before playing with this!"),
		 span({-style=>'color: magenta'},
		      "Look Mom, no hands!",
		      p(),
		      "Whooo wee!"
		      );
	   print end_html;

       Pass an array reference to -style in order to incorporate
       multiple stylesheets into your document.

DEBUGGING
       If you are running the script from the command line or in
       the perl debugger, you can pass the script a list of key
       words or parameter=value pairs on the command line or from
       standard input (you don't have to worry about tricking
       your script into reading from environment variables).  You
       can pass keywords like this:

	   your_script.pl keyword1 keyword2 keyword3

       or this:

	  your_script.pl keyword1+keyword2+keyword3

       or this:

	   your_script.pl name1=value1 name2=value2

       or this:

	   your_script.pl name1=value1&name2=value2

       To turn off this feature, use the -no_debug pragma.

       To test the POST method, you may enable full debugging
       with the -debug pragma.	This will allow you to feed new
       line-delimited name=value pairs to the script on standard
       input.

       When debugging, you can use quotes and backslashes to
       escape characters in the familiar shell manner, letting
       you place spaces and other funny characters in your param
       eter=value pairs:

	  your_script.pl "name1='I am a long value'" "name2=two\ words"

       DUMPING OUT ALL THE NAME/VALUE PAIRS

       The Dump() method produces a string consisting of all the
       query's name/value pairs formatted nicely as a nested
       list.  This is useful for debugging purposes:

	   print $query->Dump

       Produces something that looks like:

	   <UL>
	   <LI>name1
	       <UL>
	       <LI>value1
	       <LI>value2
	       </UL>
	   <LI>name2
	       <UL>
	       <LI>value1
	       </UL>
	   </UL>

       As a shortcut, you can interpolate the entire CGI object
       into a string and it will be replaced with the a nice HTML
       dump shown above:

	   $query=new CGI;
	   print "<H2>Current Values</H2> $query\n";

FETCHING ENVIRONMENT VARIABLES
       Some of the more useful environment variables can be
       fetched through this interface.	The methods are as fol
       lows:

       Accept()
	   Return a list of MIME types that the remote browser
	   accepts. If you give this method a single argument
	   corresponding to a MIME type, as in
	   $query->Accept('text/html'), it will return a floating
	   point value corresponding to the browser's preference
	   for this type from 0.0 (don't want) to 1.0.	Glob
	   types (e.g. text/*) in the browser's accept list are
	   handled correctly.

	   Note that the capitalization changed between version
	   2.43 and 2.44 in order to avoid conflict with Perl's
	   accept() function.

       raw_cookie()
	   Returns the HTTP_COOKIE variable, an HTTP extension
	   implemented by Netscape browsers version 1.1 and
	   higher, and all versions of Internet Explorer.  Cook
	   ies have a special format, and this method call just
	   returns the raw form (?cookie dough).  See cookie()
	   for ways of setting and retrieving cooked cookies.

	   Called with no parameters, raw_cookie() returns the
	   packed cookie structure.  You can separate it into
	   individual cookies by splitting on the character
	   sequence "; ".  Called with the name of a cookie,
	   retrieves the unescaped form of the cookie.	You can
	   use the regular cookie() method to get the names, or
	   use the raw_fetch() method from the CGI::Cookie mod
	   ule.

       user_agent()
	   Returns the HTTP_USER_AGENT variable.  If you give
	   this method a single argument, it will attempt to pat
	   tern match on it, allowing you to do something like
	   $query->user_agent(netscape);

       path_info()
	   Returns additional path information from the script
	   URL.	 E.G. fetching /cgi-bin/your_script/addi
	   tional/stuff will result in $query->path_info()
	   returning "/additional/stuff".

	   NOTE: The Microsoft Internet Information Server is
	   broken with respect to additional path information.
	   If you use the Perl DLL library, the IIS server will
	   attempt to execute the additional path information as
	   a Perl script.  If you use the ordinary file associa
	   tions mapping, the path information will be present in
	   the environment, but incorrect.  The best thing to do
	   is to avoid using additional path information in CGI
	   scripts destined for use with IIS.

       path_translated()
	   As per path_info() but returns the additional path
	   information translated into a physical path, e.g.
	   "/usr/local/etc/httpd/htdocs/additional/stuff".

	   The Microsoft IIS is broken with respect to the trans
	   lated path as well.

       remote_host()
	   Returns either the remote host name or IP address.  if
	   the former is unavailable.

       script_name()
	   Return the script name as a partial URL, for self-
	   refering scripts.

       referer()
	   Return the URL of the page the browser was viewing
	   prior to fetching your script.  Not available for all
	   browsers.

       auth_type ()
	   Return the authorization/verification method in use
	   for this script, if any.

       server_name ()
	   Returns the name of the server, usually the machine's
	   host name.

       virtual_host ()
	   When using virtual hosts, returns the name of the host
	   that the browser attempted to contact

       server_port ()
	   Return the port that the server is listening on.

       server_software ()
	   Returns the server software and version number.

       remote_user ()
	   Return the authorization/verification name used for
	   user verification, if this script is protected.

       user_name ()
	   Attempt to obtain the remote user's name, using a
	   variety of different techniques.  This only works with
	   older browsers such as Mosaic.  Newer browsers do not
	   report the user name for privacy reasons!

       request_method()
	   Returns the method used to access your script, usually
	   one of 'POST', 'GET' or 'HEAD'.

       content_type()
	   Returns the content_type of data submitted in a POST,
	   generally multipart/form-data or application/x-www-
	   form-urlencoded

       http()
	   Called with no arguments returns the list of HTTP
	   environment variables, including such things as
	   HTTP_USER_AGENT, HTTP_ACCEPT_LANGUAGE, and
	   HTTP_ACCEPT_CHARSET, corresponding to the like-named
	   HTTP header fields in the request.  Called with the
	   name of an HTTP header field, returns its value.  Cap
	   italization and the use of hyphens versus underscores
	   are not significant.

	   For example, all three of these examples are equiva
	   lent:

	      $requested_language = $q->http('Accept-language');
	      $requested_language = $q->http('Accept_language');
	      $requested_language = $q->http('HTTP_ACCEPT_LANGUAGE');

       https()
	   The same as http(), but operates on the HTTPS environ
	   ment variables present when the SSL protocol is in
	   effect.  Can be used to determine whether SSL is
	   turned on.

USING NPH SCRIPTS
       NPH, or "no-parsed-header", scripts bypass the server com
       pletely by sending the complete HTTP header directly to
       the browser.  This has slight performance benefits, but is
       of most use for taking advantage of HTTP extensions that
       are not directly supported by your server, such as server
       push and PICS headers.

       Servers use a variety of conventions for designating CGI
       scripts as NPH.	Many Unix servers look at the beginning
       of the script's name for the prefix "nph-".  The Macintosh
       WebSTAR server and Microsoft's Internet Information
       Server, in contrast, try to decide whether a program is an
       NPH script by examining the first line of script output.

       CGI.pm supports NPH scripts with a special NPH mode.  When
       in this mode, CGI.pm will output the necessary extra
       header information when the header() and redirect() meth
       ods are called.

       The Microsoft Internet Information Server requires NPH
       mode.  As of version 2.30, CGI.pm will automatically
       detect when the script is running under IIS and put itself
       into this mode.	You do not need to do this manually,
       although it won't hurt anything if you do.

       There are a number of ways to put CGI.pm into NPH mode:

       In the use statement
	   Simply add the "-nph" pragmato the list of symbols to
	   be imported into your script:

		 use CGI qw(:standard -nph)

       By calling the nph() method:
	   Call nph() with a non-zero parameter at any point
	   after using CGI.pm in your program.

		 CGI->nph(1)

       By using -nph parameters
	   in the header() and redirect()  statements:

		 print $q->header(-nph=>1);

Server Push
       CGI.pm provides four simple functions for producing multi
       part documents of the type needed to implement server
       push.  These functions were graciously provided by Ed Jor
       dan <ed@fidalgo.net>.  To import these into your names
       pace, you must import the ":push" set.  You are also
       advised to put the script into NPH mode and to set $| to 1
       to avoid buffering problems.

       Here is a simple script that demonstrates server push:

	 #!/usr/local/bin/perl
	 use CGI qw/:push -nph/;
	 $| = 1;
	 print multipart_init(-boundary=>'----here we go!');
	 foreach (0 .. 4) {
	     print multipart_start(-type=>'text/plain'),
		   "The current time is ",scalar(localtime),"\n";
	     if ($_ < 4) {
		     print multipart_end;
	     } else {
		     print multipart_final;
	     }
	     sleep 1;
	 }

       This script initializes server push by calling multi_
       part_init().  It then enters a loop in which it begins a
       new multipart section by calling multipart_start(), prints
       the current local time, and ends a multipart section with
       multipart_end().	 It then sleeps a second, and begins
       again. On the final iteration, it ends the multipart sec
       tion with multipart_final() rather than with multi_
       part_end().

       multipart_init()
	     multipart_init(-boundary=>$boundary);

	   Initialize the multipart system.  The -boundary argu
	   ment specifies what MIME boundary string to use to
	   separate parts of the document.  If not provided,
	   CGI.pm chooses a reasonable boundary for you.

       multipart_start()
	     multipart_start(-type=>$type)

	   Start a new part of the multipart document using the
	   specified MIME type.	 If not specified, text/html is
	   assumed.

       multipart_end()
	     multipart_end()

	   End a part.	You must remember to call multipart_end()
	   once for each multipart_start(), except at the end of
	   the last part of the multipart document when multi_
	   part_final() should be called instead of multi_
	   part_end().

       multipart_final()
	     multipart_final()

	   End all parts.  You should call multipart_final()
	   rather than multipart_end() at the end of the last
	   part of the multipart document.

       Users interested in server push applications should also
       have a look at the CGI::Push module.

       Only Netscape Navigator supports server push.  Internet
       Explorer browsers do not.

Avoiding Denial of Service Attacks
       A potential problem with CGI.pm is that, by default, it
       attempts to process form POSTings no matter how large they
       are.  A wily hacker could attack your site by sending a
       CGI script a huge POST of many megabytes.  CGI.pm will
       attempt to read the entire POST into a variable, growing
       hugely in size until it runs out of memory.  While the
       script attempts to allocate the memory the system may slow
       down dramatically.  This is a form of denial of service
       attack.

       Another possible attack is for the remote user to force
       CGI.pm to accept a huge file upload.  CGI.pm will accept
       the upload and store it in a temporary directory even if
       your script doesn't expect to receive an uploaded file.
       CGI.pm will delete the file automatically when it termi
       nates, but in the meantime the remote user may have filled
       up the server's disk space, causing problems for other
       programs.

       The best way to avoid denial of service attacks is to
       limit the amount of memory, CPU time and disk space that
       CGI scripts can use.  Some Web servers come with built-in
       facilities to accomplish this. In other cases, you can use
       the shell limit or ulimit commands to put ceilings on CGI
       resource usage.

       CGI.pm also has some simple built-in protections against
       denial of service attacks, but you must activate them
       before you can use them.	 These take the form of two
       global variables in the CGI name space:

       $CGI::POST_MAX
	   If set to a non-negative integer, this variable puts a
	   ceiling on the size of POSTings, in bytes.  If CGI.pm
	   detects a POST that is greater than the ceiling, it
	   will immediately exit with an error message.	 This
	   value will affect both ordinary POSTs and multipart
	   POSTs, meaning that it limits the maximum size of file
	   uploads as well.  You should set this to a reasonably
	   high value, such as 1 megabyte.

       $CGI::DISABLE_UPLOADS
	   If set to a non-zero value, this will disable file
	   uploads completely.	Other fill-out form values will
	   work as usual.

       You can use these variables in either of two ways.

       1. On a script-by-script basis
	   Set the variable at the top of the script, right after
	   the "use" statement:

	       use CGI qw/:standard/;
	       use CGI::Carp 'fatalsToBrowser';
	       $CGI::POST_MAX=1024 * 100;  # max 100K posts
	       $CGI::DISABLE_UPLOADS = 1;  # no uploads

       2. Globally for all scripts
	   Open up CGI.pm, find the definitions for $POST_MAX and
	   $DISABLE_UPLOADS, and set them to the desired values.
	   You'll find them towards the top of the file in a sub
	   routine named initialize_globals().

       An attempt to send a POST larger than $POST_MAX bytes will
       cause param() to return an empty CGI parameter list.  You
       can test for this event by checking cgi_error(), either
       after you create the CGI object or, if you are using the
       function-oriented interface, call <param()> for the first
       time.  If the POST was intercepted, then cgi_error() will
       return the message "413 POST too large".

       This error message is actually defined by the HTTP proto
       col, and is designed to be returned to the browser as the
       CGI script's status
	code.  For example:

	  $uploaded_file = param('upload');
	  if (!$uploaded_file && cgi_error()) {
	     print header(-status=>cgi_error());
	     exit 0;
	  }

       However it isn't clear that any browser currently knows
       what to do with this status code.  It might be better just
       to create an HTML page that warns the user of the problem.

COMPATIBILITY WITH CGI-LIB.PL
       To make it easier to port existing programs that use cgi-
       lib.pl the compatibility routine "ReadParse" is provided.
       Porting is simple:

       OLD VERSION
	   require "cgi-lib.pl";
	   &ReadParse;
	   print "The value of the antique is $in{antique}.\n";

       NEW VERSION
	   use CGI;
	   CGI::ReadParse
	   print "The value of the antique is $in{antique}.\n";

       CGI.pm's ReadParse() routine creates a tied variable named
       %in, which can be accessed to obtain the query variables.
       Like ReadParse, you can also provide your own variable.
       Infrequently used features of ReadParse, such as the cre
       ation of @in and $in variables, are not supported.

       Once you use ReadParse, you can retrieve the query object
       itself this way:

	   $q = $in{CGI};
	   print $q->textfield(-name=>'wow',
			       -value=>'does this really work?');

       This allows you to start using the more interesting fea
       tures of CGI.pm without rewriting your old scripts from
       scratch.

AUTHOR INFORMATION
       Copyright 1995-1998, Lincoln D. Stein.  All rights
       reserved.

       This library is free software; you can redistribute it
       and/or modify it under the same terms as Perl itself.

       Address bug reports and comments to: lstein@cshl.org.
       When sending bug reports, please provide the version of
       CGI.pm, the version of Perl, the name and version of your
       Web server, and the name and version of the operating sys
       tem you are using.  If the problem is even remotely
       browser dependent, please provide information about the
       affected browers as well.

CREDITS
       Thanks very much to:

       Matt Heffron (heffron@falstaff.css.beckman.com)
       James Taylor (james.taylor@srs.gov)
       Scott Anguish <sanguish@digifix.com>
       Mike Jewell (mlj3u@virginia.edu)
       Timothy Shimmin (tes@kbs.citri.edu.au)
       Joergen Haegg (jh@axis.se)
       Laurent Delfosse (delfosse@delfosse.com)
       Richard Resnick (applepi1@aol.com)
       Craig Bishop (csb@barwonwater.vic.gov.au)
       Tony Curtis (tc@vcpc.univie.ac.at)
       Tim Bunce (Tim.Bunce@ig.co.uk)
       Tom Christiansen (tchrist@convex.com)

       Andreas Koenig (k@franz.ww.TU-Berlin.DE)
       Tim MacKenzie (Tim.MacKenzie@fulcrum.com.au)
       Kevin B. Hendricks (kbhend@dogwood.tyler.wm.edu)
       Stephen Dahmen (joyfire@inxpress.net)
       Ed Jordan (ed@fidalgo.net)
       David Alan Pisoni (david@cnation.com)
       Doug MacEachern (dougm@opengroup.org)
       Robin Houston (robin@oneworld.org)
       ...and many many more...
	   for suggestions and bug fixes.

A COMPLETE EXAMPLE OF A SIMPLE FORM-BASED SCRIPT
	       #!/usr/local/bin/perl

	       use CGI;

	       $query = new CGI;

	       print $query->header;
	       print $query->start_html("Example CGI.pm Form");
	       print "<H1> Example CGI.pm Form</H1>\n";
	       &print_prompt($query);
	       &do_work($query);
	       &print_tail;
	       print $query->end_html;

	       sub print_prompt {
		  my($query) = @_;

		  print $query->start_form;
		  print "<EM>What's your name?</EM><BR>";
		  print $query->textfield('name');
		  print $query->checkbox('Not my real name');

		  print "<P><EM>Where can you find English Sparrows?</EM><BR>";
		  print $query->checkbox_group(
					-name=>'Sparrow locations',
					-values=>[England,France,Spain,Asia,Hoboken],
					-linebreak=>'yes',
					-defaults=>[England,Asia]);

		  print "<P><EM>How far can they fly?</EM><BR>",
		       $query->radio_group(
			       -name=>'how far',
			       -values=>['10 ft','1 mile','10 miles','real far'],
			       -default=>'1 mile');

		  print "<P><EM>What's your favorite color?</EM>  ";
		  print $query->popup_menu(-name=>'Color',
					   -values=>['black','brown','red','yellow'],
					   -default=>'red');

		  print $query->hidden('Reference','Monty Python and the Holy Grail');

		  print "<P><EM>What have you got there?</EM><BR>";
		  print $query->scrolling_list(
				-name=>'possessions',
				-values=>['A Coconut','A Grail','An Icon',
					  'A Sword','A Ticket'],
				-size=>5,
				-multiple=>'true');

		  print "<P><EM>Any parting comments?</EM><BR>";
		  print $query->textarea(-name=>'Comments',
					 -rows=>10,
					 -columns=>50);

		  print "<P>",$query->reset;
		  print $query->submit('Action','Shout');
		  print $query->submit('Action','Scream');
		  print $query->endform;
		  print "<HR>\n";
	       }

	       sub do_work {
		  my($query) = @_;
		  my(@values,$key);

		  print "<H2>Here are the current settings in this form</H2>";

		  foreach $key ($query->param) {
		     print "<STRONG>$key</STRONG> -> ";
		     @values = $query->param($key);
		     print join(", ",@values),"<BR>\n";
		 }
	       }

	       sub print_tail {
		  print <<END;
	       <HR>
	       <ADDRESS>Lincoln D. Stein</ADDRESS><BR>
	       <A HREF="/">Home Page</A>
	       END
	       }

BUGS
       This module has grown large and monolithic.  Furthermore
       it's doing many things, such as handling URLs, parsing CGI
       input, writing HTML, etc., that are also done in the LWP
       modules. It should be discarded in favor of the CGI::*
       modules, but somehow I continue to work on it.

       Note that the code is truly contorted in order to avoid
       spurious warnings when programs are run with the -w
       switch.

SEE ALSO
       the CGI::Carp manpage, the URI::URL manpage, the
       CGI::Request manpage, the CGI::MiniSvr manpage, the
       CGI::Base manpage, the CGI::Form manpage, the CGI::Push
       manpage, the CGI::Fast manpage, the CGI::Pretty manpage

2001-02-22		   perl v5.6.1			   CGI(3)
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