Friday, July 10, 2009

Perl: Http::Cookies not saving cookie correctly

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The below code for saving the http cookie after requesting some data over http is not working!!! Did you face this kind of problem anyway?


For example the server sent you 4 cookies. But your cookie_jar is only saving the 2 of them, and rest of the two are ignored. Do you know the reason behind this?

It's not a bug of http cookies of perl, or lwp. Just lack of knowing the issue. Initially I thought it was a bug. The rest of the two cookies are session cookie. And it will die when you'll close your browser( this case your LWP ). That's why Http::Cookies is not saving the cookie on your file. Here is what it was said on the docs of HTTP::Cookies,

$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.

So, this means you have to notify the cookie_jar to save your session cookie too. To do this you have to do as below.

$cookie_jar = HTTP::Cookies->new(
file => "cookie.txt",
ignore_discard => 1,

$cookie_jar = HTTP::Cookies->new(
ignore_discard => 1,


mikecanz said...

This was exactly what I needed. Thanks for the post.

Anonymous said...

thx! it's helped me.