How does the caching of pages for the WMF projects work? == Setting == On 1th April the [[MediaWiki:Tagline]] page, controlling the "From Wikipedia, the free encyclopedia" text line, was changed several times. From; 08:06, 1 April 2008 until; 08:07, 1 April 2008 so at max 1 minute, probably shorter, the text was; "From Britannica, the encyclopedia that is slightly more accurate than Wikipedia according to a paper in the eminent journal ''Nature''... " After that is was changed again a couple of times in to different messages during that day; From Wikipedia, the free Pokémon encyclopedia From Whippetpedia, the free encyclopedia for dogs From Wikipedia, the free encyclopedia administer by people with a stick up their lavender passageway From Wikipedia, the free encyclopedia that triples in population every six months One of the edit summary's was; "Relax; these are completely harmless, and just for a day. "Yes, we're aware of Wikipedia's criticisms, and we're still confident enough in our project that we can joke about it" == On topic == When I requested the page; http://en.wikipedia.org/wiki/Blue_Gender around midnight 2008-04-07 I noticed that the tagline on that page was; "From Britannica, the encyclopaedia that is slightly more accurate than Wikipedia according to a paper in the eminent journal ''Nature''... " When I logged in it was gone, back the normal one. Also when I logged out again it was also again the normal tag line. == My question == How does the caching works? I suspect that I have seen that changed tag line on that page because that specific page was cached just in that very short time frame the tag line was changed to that text. And because the page was not edited that cached version was not renewed. What I like to know is how long can cached version being used to show a page when it is requested? When does it expire? And because there are many squids; can it be that depending the squid who serves you can get different results? I would like to know that for use in wikizine. -- Contact: walter AT wikizine DOT org Wikizine.org - news for and about the Wikimedia community