Hopefully this is the right list for this questions: Currently running squid 2.6.STABLE21-3 (the RedHat distributed one), and having problems with a specific site that makes of use of HTTP 1.1. The issue can be boiled down to this: The site loads a page and asks the browser NOT to cache it. Then it asks the browser to reload it a 2nd and 3rd time. The 2nd and 3rd load depend on the browser pulling fresh data from the server. When it works, it looks like this: *** Client request #1: GET http://www.[...snipped...].com/boost-gzip-cookie-test.html HTTP/1.0 Accept: */* Referer: http://www.[...snipped...].com/ Accept-Language: en-us UA-CPU: x86 Connection: Keep-Alive User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; [...snipped...]) Cookie: has_js=1; cmTPSet=Y Host: www.[...snipped...].com *** Server reply #1 (headers only shown): HTTP/1.1 200 OK Date: Tue, 08 Feb 2011 03:48:57 GMT Server: Apache/2.2.3 (Red Hat) Last-Modified: Thu, 03 Feb 2011 21:32:11 GMT ETag: "17c801c-15a-49b677f912cc0" Accept-Ranges: bytes Content-Length: 460 Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0 Expires: Sun, 19 Nov 1978 05:00:00 GMT X-Header: Boost Citrus 1.8 Connection: close Content-Type: text/html; charset=utf-8 *** Client request #2: GET http://www.[...snipped...].com/boost-gzip-cookie-test.html HTTP/1.0 Accept: image/gif, image/x-xbitmap, [...snipped...], application/xaml+xml, */* Accept-Language: en-us UA-CPU: x86 Connection: Keep-Alive User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; [...snipped...]) Host: www.[...snipped...].com Cookie: has_js=1; cmTPSet=Y *** Server reply #2: HTTP/1.1 200 OK Date: Tue, 08 Feb 2011 03:48:57 GMT Server: Apache/2.2.3 (Red Hat) Last-Modified: Thu, 03 Feb 2011 21:32:11 GMT ETag: "17c801c-15a-49b677f912cc0" Accept-Ranges: bytes Content-Length: 460 Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0 Expires: Sun, 19 Nov 1978 05:00:00 GMT X-Header: Boost Citrus 1.8 Connection: close Content-Type: text/html; charset=utf-8 Request and Reply #3 are exactly the same as #2. As you can see, the site depends on the browser honoring the Cache-Control header, which is an HTTP 1.1 construct. When traffic goes through Squid, however, what you get is this: *** Client request #1: GET http://www.[...snipped...].com/boost-gzip-cookie-test.html HTTP/1.0 Accept: */* Referer: http://www.[...snipped...].com/ Accept-Language: en-us UA-CPU: x86 Proxy-Connection: Keep-Alive User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; [...snipped...]) Cookie: has_js=1; cmTPSet=Y Proxy-Authorization: [...snipped...] Host: www.[...snipped...].com *** Reply #1: HTTP/1.0 200 OK Date: Tue, 08 Feb 2011 03:08:16 GMT Server: Apache/2.2.3 (Red Hat) Last-Modified: Thu, 03 Feb 2011 21:32:11 GMT ETag: "17c801c-15a-49b677f912cc0" Accept-Ranges: bytes Content-Length: 346 Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0 Expires: Sun, 19 Nov 1978 05:00:00 GMT X-Header: Boost Citrus 1.8 Content-Type: text/html; charset=utf-8 Content-Encoding: gzip X-Cache: MISS from [...snipped...] X-Cache-Lookup: MISS from [...snipped...]:3128 Via: 1.0 [...sniped...]:3128 (squid/2.6.STABLE21) Proxy-Connection: keep-alive *** Client request #2: GET http://www.[...snipped...].com/boost-gzip-cookie-test.html HTTP/1.0 Accept: image/gif, image/x-xbitmap, image/jpeg, [...snipped...], application/xaml+xml, */* Accept-Language: en-us UA-CPU: x86 Proxy-Connection: Keep-Alive If-Modified-Since: Thu, 03 Feb 2011 21:32:11 GMT; length=346 User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; [...snipped...]) Cookie: has_js=1; cmTPSet=Y Proxy-Authorization: [...snipped...] Host: www.[...snipped...].com *** Reply #2: HTTP/1.0 304 Not Modified Date: Tue, 08 Feb 2011 03:08:16 GMT Server: Apache/2.2.3 (Red Hat) ETag: "17c801c-15a-49b677f912cc0" Expires: Sun, 19 Nov 1978 05:00:00 GMT Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0 X-Cache: MISS from [...snipped...] X-Cache-Lookup: MISS from [...snipped...]:3128 Via: 1.0 [...snipped...]:3128 (squid/2.6.STABLE21) Proxy-Connection: keep-alive Well, now the browser is sending "If-Modified-Since:" and Squid says "Not Modified." That kind of breaks the subsequent pages that load from that site. It seems to me that IE7 and IE8 (the two I tested with) do not honor the Cache-Control header if they see an HTTP/1.0 response. So, the question is: What are the possible solutions that I can implement? Things like changing the browser or asking the site to stop doing the boost-gzip-cookie-test are not viable solutions. I'm thinking about an upgrade to 2.7 or 3.1, but that will take some time to plan and test. Plus, I'm not sure that an upgrade will fix the problem, anyway. Anyone know? Ideally I'm hoping that there's some way to tell Squid not to modify the server responses when the request asks fora boost-gzip-cookie-test.html. Is there? Or maybe to insert a "Pragma: No-cache" into the reply? What other solutions are out there? Thanks much! P.S. The site shown in this example is http://www.simpletruths.com/movies.asp. Any of the movies will do this gzip test before loading, and Squid breaks them.
