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20.14. Using Cookies
20.14.1. Problem
You want to fetch web pages, but the
server is using cookies to track you. For example, some sites use a
cookie to remember that you''ve authenticated. If you don''t send the
right cookie, you''ll never get past the login screen.
20.14.2. Solution
Let LWP::UserAgent handle cookies for
you. You can enable cookies for just this program run
with:
$ua->cookie_jar({ });Or instead store cookies in a file between invocations with:
$ua->cookie_jar({ file => "$ENV{HOME}/.cookies" });20.14.3. Discussion
The default behavior of LWP::UserAgent is never to send a
Cookie: header, even when the server offers
cookies in a response. To keep track of cookies LWP::UserAgent
receives and send them when appropriate, provide the user agent
object with a special "cookie jar" object to hold the cookies: an
HTTP::Cookies object.
Pass
the cookie_jar method either an HTTP::Cookies
object to use that object as the cookie jar, or else a hash reference
whose contents go into a new HTTP::Cookies object.Without parameters, an HTTP::Cookies object keeps cookies in memory,
so they''re no longer available once your program exits. The
file parameter in the
cookie_jar method call specifies a filename to use
for initializing the cookie jar and for saving updated or new
cookies. This is how you give cookies a shelf life beyond a single
run of your program.To disable cookies, call cookie_jar with no
parameters:
$ua->cookie_jar( );
20.14.4. See Also
The documentation for the CPAN modules LWP::UserAgent and HTTP::Cookie
