eelkeblok's sandbox: Cached poll

This module adds, to core Polls, a principal akin to that implemented by the Pressflow cookie_cache_bypass module to core Polls. The reason to do this is threefold:

• cookie_cache_bypass does not work from forms that put submit functions in form elements (e.g. submit buttons), which the Poll module does;
• it gives us the opportunity to put a much longer cookie lifetime for polls;
• it allows us to recheck the cookie when the poll module determines it should show the results to the current user becasue they have already voted. This way, we can prevent the results from endinf up in the page cache even if the cookie was not sent from the client.

This module sets a cookie with the name NO_CACHE_POLLS when submitting a poll voting or cancel form. Your reverse proxy configuration will likely need to be ammended to allow not just NO_CACHE cookies, but any cookie with a name starting with "NO_CACHE". E.g. for Varnish:

Change

set req.http.Cookie = regsuball(req.http.Cookie, ";(NO_CACHE|SESS[^=]+)=", "; \1=");

to

set req.http.Cookie = regsuball(req.http.Cookie, ";(NO_CACHE[^=]*|SESS[^=]+)=", "; \1=");