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NAME
HTTP::Cookies - HTTP cookie jars
SYNOPSIS
use HTTP::Cookies;
$cookie_jar = HTTP::Cookies->new(
file => "$ENV{'HOME'}/lwp_cookies.dat",
autosave => 1,
);
use LWP;
my $browser = LWP::UserAgent->new;
$browser->cookie_jar($cookie_jar);
Or for an empty and temporary cookie jar:
use LWP;
my $browser = LWP::UserAgent->new;
$browser->cookie_jar( {} );
DESCRIPTION
This class is for objects that represent a "cookie jar" -- that is, a
database of all the HTTP cookies that a given LWP::UserAgent object
knows about.
Cookies are a general mechanism which server side connections can use to
both store and retrieve information on the client side of the
connection. For more information about cookies refer to
<URL:http://curl.haxx.se/rfc/cookie_spec.html> and
<URL:http://www.cookiecentral.com/>. This module also implements the new
style cookies described in *RFC 2965*. The two variants of cookies are
supposed to be able to coexist happily.
Instances of the class *HTTP::Cookies* are able to store a collection of
Set-Cookie2: and Set-Cookie: headers and are able to use this
information to initialize Cookie-headers in *HTTP::Request* objects. The
state of a *HTTP::Cookies* object can be saved in and restored from
files.
METHODS
The following methods are provided:
$cookie_jar = HTTP::Cookies->new
The constructor takes hash style parameters. The following
parameters are recognized:
file: name of the file to restore cookies from and save cookies to
autosave: save during destruction (bool)
ignore_discard: save even cookies that are requested to be discarded (bool)
hide_cookie2: do not add Cookie2 header to requests
Future parameters might include (not yet implemented):
max_cookies 300
max_cookies_per_domain 20
max_cookie_size 4096
no_cookies list of domain names that we never return cookies to
$cookie_jar->add_cookie_header( $request )
The add_cookie_header() method will set the appropriate
Cookie:-header for the *HTTP::Request* object given as argument. The
$request must have a valid url attribute before this method is
called.
$cookie_jar->extract_cookies( $response )
The extract_cookies() method will look for Set-Cookie: and
Set-Cookie2: headers in the *HTTP::Response* object passed as
argument. Any of these headers that are found are used to update the
state of the $cookie_jar.
$cookie_jar->set_cookie( $version, $key, $val, $path, $domain, $port,
$path_spec, $secure, $maxage, $discard, \%rest )
The set_cookie() method updates the state of the $cookie_jar. The
$key, $val, $domain, $port and $path arguments are strings. The
$path_spec, $secure, $discard arguments are boolean values. The
$maxage value is a number indicating number of seconds that this
cookie will live. A value <= 0 will delete this cookie. %rest
defines various other attributes like "Comment" and "CommentURL".
$cookie_jar->save
$cookie_jar->save( $file )
This method file saves the state of the $cookie_jar to a file. The
state can then be restored later using the load() method. If a
filename is not specified we will use the name specified during
construction. If the attribute *ignore_discard* is set, then we will
even save cookies that are marked to be discarded.
The default is to save a sequence of "Set-Cookie3" lines.
"Set-Cookie3" is a proprietary LWP format, not known to be
compatible with any browser. The *HTTP::Cookies::Netscape* sub-class
can be used to save in a format compatible with Netscape.
$cookie_jar->load
$cookie_jar->load( $file )
This method reads the cookies from the file and adds them to the
$cookie_jar. The file must be in the format written by the save()
method.
$cookie_jar->revert
This method empties the $cookie_jar and re-loads the $cookie_jar
from the last save file.
$cookie_jar->clear
$cookie_jar->clear( $domain )
$cookie_jar->clear( $domain, $path )
$cookie_jar->clear( $domain, $path, $key )
Invoking this method without arguments will empty the whole
$cookie_jar. If given a single argument only cookies belonging to
that domain will be removed. If given two arguments, cookies
belonging to the specified path within that domain are removed. If
given three arguments, then the cookie with the specified key, path
and domain is removed.
$cookie_jar->clear_temporary_cookies
Discard all temporary cookies. Scans for all cookies in the jar with
either no expire field or a true `discard' flag. To be called when
the user agent shuts down according to RFC 2965.
$cookie_jar->scan( \&callback )
The argument is a subroutine that will be invoked for each cookie
stored in the $cookie_jar. The subroutine will be invoked with the
following arguments:
0 version
1 key
2 val
3 path
4 domain
5 port
6 path_spec
7 secure
8 expires
9 discard
10 hash
$cookie_jar->as_string
$cookie_jar->as_string( $skip_discardables )
The as_string() method will return the state of the $cookie_jar
represented as a sequence of "Set-Cookie3" header lines separated by
"\n". If $skip_discardables is TRUE, it will not return lines for
cookies with the *Discard* attribute.
SEE ALSO
HTTP::Cookies::Netscape, HTTP::Cookies::Microsoft
COPYRIGHT
Copyright 1997-2002 Gisle Aas
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.