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CGI::Cookie(3pm)		 Perl Programmers Reference Guide		 CGI::Cookie(3pm)

       CGI::Cookie - Interface to Netscape Cookies

	   use CGI qw/:standard/;
	   use CGI::Cookie;

	   # Create new cookies and send them
	   $cookie1 = new CGI::Cookie(-name=>'ID',-value=>123456);
	   $cookie2 = new CGI::Cookie(-name=>'preferences',
				      -value=>{ font => Helvetica,
						size => 12 }
	   print header(-cookie=>[$cookie1,$cookie2]);

	   # fetch existing cookies
	   %cookies = fetch CGI::Cookie;
	   $id = $cookies{'ID'}->value;

	   # create cookies returned from an external source
	   %cookies = parse CGI::Cookie($ENV{COOKIE});

       CGI::Cookie is an interface to Netscape (HTTP/1.1) cookies, an innovation that allows Web
       servers to store persistent information on the browser's side of the connection.  Although
       CGI::Cookie is intended to be used in conjunction with CGI.pm (and is in fact used by it
       internally), you can use this module independently.

       For full information on cookies see


       CGI::Cookie is object oriented.	Each cookie object has a name and a value.  The name is
       any scalar value.  The value is any scalar or array value (associative arrays are also
       allowed).  Cookies also have several optional attributes, including:

       1. expiration date
	   The expiration date tells the browser how long to hang on to the cookie.  If the
	   cookie specifies an expiration date in the future, the browser will store the cookie
	   information in a disk file and return it to the server every time the user reconnects
	   (until the expiration date is reached).  If the cookie species an expiration date in
	   the past, the browser will remove the cookie from the disk file.  If the expiration
	   date is not specified, the cookie will persist only until the user quits the browser.

       2. 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 Netscape will return the cookie
	   to Web servers running on any of the machines "www.capricorn.com", "ftp.capri-
	   corn.com", "feckless.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 specified, then the browser will only return the cookie to servers on the host the
	   cookie originated from.

       3. path
	   If you provide a cookie path attribute, the browser will check it against your
	   script's URL before returning 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/complain.pl",
	   but not to the script "/cgi-private/site_admin.pl".	By default, the path is set to
	   "/", so that all scripts at your site will receive the cookie.

       4. 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.

       Creating New Cookies

	       $c = new CGI::Cookie(-name    =>  'foo',
				    -value   =>  'bar',
				    -expires =>  '+3M',
				    -domain  =>  '.capricorn.com',
				    -path    =>  '/cgi-bin/database',
				    -secure  =>  1

       Create cookies from scratch with the new method.  The -name and -value parameters are
       required.  The name must be a scalar value.  The value can be a scalar, an array refer-
       ence, or a hash reference.  (At some point in the future cookies will support one of the
       Perl object serialization protocols for full generality).

       -expires accepts any of the relative or absolute date formats recognized by CGI.pm, for
       example "+3M" for three months in the future.  See CGI.pm's documentation for details.

       -domain points to a domain name or to a fully qualified host name.  If not specified, the
       cookie will be returned only to the Web server that created it.

       -path points to a partial URL on the current server.  The cookie will be returned to all
       URLs beginning with the specified path.	If not specified, it defaults to '/', which
       returns the cookie to all pages at your site.

       -secure if set to a true value instructs the browser to return the cookie only when a
       cryptographic protocol is in use.

       Sending the Cookie to the Browser

       Within a CGI script you can send a cookie to the browser by creating one or more
       Set-Cookie: fields in the HTTP header.  Here is a typical sequence:

	 my $c = new CGI::Cookie(-name	  =>  'foo',
				 -value   =>  ['bar','baz'],
				 -expires =>  '+3M');

	 print "Set-Cookie: $c\n";
	 print "Content-Type: text/html\n\n";

       To send more than one cookie, create several Set-Cookie: fields.  Alternatively, you may
       concatenate the cookies together with "; " and send them in one field.

       If you are using CGI.pm, you send cookies by providing a -cookie argument to the header()

	 print header(-cookie=>$c);

       Mod_perl users can set cookies using the request object's header_out() method:


       Internally, Cookie overloads the "" operator to call its as_string() method when incorpo-
       rated into the HTTP header.  as_string() turns the Cookie's internal representation into
       an RFC-compliant text representation.  You may call as_string() yourself if you prefer:

	 print "Set-Cookie: ",$c->as_string,"\n";

       Recovering Previous Cookies

	       %cookies = fetch CGI::Cookie;

       fetch returns an associative array consisting of all cookies returned by the browser.  The
       keys of the array are the cookie names.	You can iterate through the cookies this way:

	       %cookies = fetch CGI::Cookie;
	       foreach (keys %cookies) {

       In a scalar context, fetch() returns a hash reference, which may be more efficient if you
       are manipulating multiple cookies.

       CGI.pm uses the URL escaping methods to save and restore reserved characters in its cook-
       ies.  If you are trying to retrieve a cookie set by a foreign server, this escaping method
       may trip you up.  Use raw_fetch() instead, which has the same semantics as fetch(), but
       performs no unescaping.

       You may also retrieve cookies that were stored in some external form using the parse()
       class method:

	      $COOKIES = `cat /usr/tmp/Cookie_stash`;
	      %cookies = parse CGI::Cookie($COOKIES);

       Manipulating Cookies

       Cookie objects have a series of accessor methods to get and set cookie attributes.  Each
       accessor has a similar syntax.  Called without arguments, the accessor returns the current
       value of the attribute.	Called with an argument, the accessor changes the attribute and
       returns its new value.

	   Get or set the cookie's name.  Example:

		   $name = $c->name;
		   $new_name = $c->name('fred');

	   Get or set the cookie's value.  Example:

		   $value = $c->value;
		   @new_value = $c->value(['a','b','c','d']);

	   value() is context sensitive.  In a list context it will return the current value of
	   the cookie as an array.  In a scalar context it will return the first value of a mul-
	   tivalued cookie.

	   Get or set the cookie's domain.

	   Get or set the cookie's path.

	   Get or set the cookie's expiration time.

       Copyright 1997-1998, 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

       This section intentionally left blank.

       CGI::Carp, CGI

perl v5.8.0				    2002-06-01				 CGI::Cookie(3pm)
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