Re: Problems with caching and headers.

Mathijs wrote: > Mathijs wrote: >> Jochem Maas wrote: >>> Mathijs wrote: >>>> Hello there, >>>> >>>> I can't figure out why there are some headers set while i don't set >>>> them >>>> myself. >>>> >>>> The following headers are sent to the browser. >>>> -Expires: Thu, 19 Nov 1981 08:52:00 GMT >>>> -Cache-Control: no-store, no-cache, must-revalidate, post-check=0, >>>> pre-check=0 >>>> -Pragma: no-cache >>>> >>>> All those i didn't set my self. >>>> >>>> Does PHP set these or something? >>> >>> maybe it was php (check your session settings and read the relevant >>> parts of the manual >>> regarding session related headers) >>> >>> maybe it was a piece of 3rd party code. >>> >>> may it was 'something' ;-) >>> >>> most likely it's the session extension doing this. >>> >> >> And you are right again :). >> Thanks again. >> >> This was a real pain in the ass. >> Because IE didn't sent the If-Last-Modified and/or if-none-match if >> one of those headers are sent. >> >> Thank you. >> >> >>>> Thx in advanced. >>>> >> > > Well it seems its working kinda. > > Now i have a problem with the ETag. what are you using this header for? > Internet Explorer seems to forget this when the content is compressed. > This because of the Vary header apparently. > > Is there a fix for this? > Or a workaround? yes. but your no longer in the realm of php (I believe) this is something you should tackle at the webserver configuration level... on one of the machines I run the (main) site has this in the config (its apache): # Netscape 4.x has some problems... BrowserMatch ^Mozilla/4 gzip-only-text/html # Netscape 4.06-4.08 have some more problems BrowserMatch ^Mozilla/4\.0[678] no-gzip # MSIE masquerades as Netscape, but it is fine BrowserMatch \bMSIE !no-gzip !gzip-only-text/html # NOTE: Due to a bug in mod_setenvif up to Apache 2.0.48 # the above regex won't work. You can use the following # workaround to get the desired effect: BrowserMatch \bMSI[E] !no-gzip !gzip-only-text/html # Don't compress images SetEnvIfNoCase Request_URI \.(?:gif|jpe?g|png)$ no-gzip dont-vary SetEnvIfNoCase Request_URI \/image\.php no-gzip dont-vary # Also don't compress PDF and Flash-files 17-01-2004 MM SetEnvIfNoCase Request_URI \.pdf$ no-gzip dont-vary SetEnvIfNoCase Request_URI \.swf$ no-gzip dont-vary # Make sure proxies don't deliver the wrong content Header append Vary User-Agent env=!dont-vary now I'm not saying these settings will work for you - the site in question runs behind an instance of Squid configured as a reverse caching proxy - which complicates matters somewhat - but it might give you an idea. > > Thx. > > > > --- > avast! Antivirus: Outbound message clean. > Virus Database (VPS): 0628-1, 07-10-2006 > Tested on: 07-11-2006 13:33:12 > avast! - copyright (c) 1988-2006 ALWIL Software. > http://www.avast.com > > >