On 11/09/2010 04:35 AM, Amos Jeffries wrote:
Unique ETag headers are required for that.
Hi Amos, I have understood as far but I still cant get my setup to behave as intended: to keep distinct versions of the same URL in cache until they expire. Distinct based on ETag value/ Vary header values. Here's what happens: **************** **A request of a logged in user (identified by the X-Username header as "X-Username: v81krndgi9jw8Oq7RqP9gpj/XkIgZGFzY2FsdQ==|Plone Default" and "ETag: |dascalu|Plone Default|1|False|||||358134") takes the object in cache: 1289284280.898 4387 127.0.0.1 TCP_MISS/200 76574 GET http://127.0.0.1:3128/VirtualHostBase/http/www.somewebsite.com:80/www/SITE/VirtualHostRoot/ - FIRST_PARENT_MISS/17 text/html [Host: 127.0.0.1:3128\r\nUser-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.9) Gecko/20100330 Fedora/3.5.9-1.fc11 Firefox/3.5.9\r\nAccept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\nAccept-Language: en-us,en;q=0.5\r\nAccept-Encoding: gzip,deflate\r\nAccept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7\r\nReferer: http://www.somewebsite.com/portal_cache_settings/old-policy/rules/frontpage?portal_status_message=Changes%2520saved.\r\nCookie: __utma=173508663.4134765344646281700.1250060356.1289254636.1289283144.57; __utmc=173508663; __utmz=173508663.1289208944.50.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); __ac="v81krndgi9jw8Oq7RqP9gpj/XkIgZGFzY2FsdQ=="; plone_skin="Plone Default"; __utmb=173508663.8.10.1289283144\r\nX-Username: v81krndgi9jw8Oq7RqP9gpj/XkIgZGFzY2FsdQ==|Plone Default\r\nX-Forwarded-For: 109.99.31.143\r\nX-Forwarded-Host: www.somewebsite.com\r\nX-Forwarded-Server: www.somewebsite.com\r\nConnection: Keep-Alive\r\n] [HTTP/1.0 200 OK\r\nServer: Zope/(Zope 2.9.10-final, python 2.4.3, linux2) ZServer/1.1 Plone/2.5.5\r\nDate: Tue, 09 Nov 2010 06:31:20 GMT\r\nContent-Length: 75865\r\nContent-Language: en\r\nExpires: Tue, 09 Nov 2010 06:31:24 GMT\r\nVary: Accept-Encoding, Accept, X-Username\r\nLast-Modified: Fri, 28 Nov 2008 07:19:49 GMT\r\nETag: |dascalu|Plone Default|1|False|||||358134\r\nX-Caching-Rule-Id: frontpage\r\nCache-Control: max-age=5, s-maxage=3600, public\r\nContent-Type: text/html;charset=utf-8\r\nX-Header-Set-Id: cache-with-etag-in-proxy\r\nX-Cache: MISS from squid1.somewebsite.com\r\nX-Cache-Lookup: MISS from squid1.somewebsite.com:3128\r\nVia: 1.0 squid1.somewebsite.com:3128 (squid/2.7.STABLE9)\r\nConnection: keep-alive\r\n\r] ***************** **A second request of the same user will be served from cache: 1289284489.560 0 127.0.0.1 TCP_MEM_HIT/200 76582 GET http://127.0.0.1:3128/VirtualHostBase/http/www.somewebsite.com:80/www/SITE/VirtualHostRoot/ - NONE/- text/html [Host: 127.0.0.1:3128\r\nUser-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.9) Gecko/20100330 Fedora/3.5.9-1.fc11 Firefox/3.5.9\r\nAccept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\nAccept-Language: en-us,en;q=0.5\r\nAccept-Encoding: gzip,deflate\r\nAccept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7\r\nReferer: http://www.somewebsite.com/\r\nCookie: __utma=173508663.4134765344646281700.1250060356.1289254636.1289283144.57; __utmc=173508663; __utmz=173508663.1289208944.50.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); __ac="v81krndgi9jw8Oq7RqP9gpj/XkIgZGFzY2FsdQ=="; plone_skin="Plone Default"; __utmb=173508663.9.10.1289283144\r\nX-Username: v81krndgi9jw8Oq7RqP9gpj/XkIgZGFzY2FsdQ==|Plone Default\r\nX-Forwarded-For: 109.99.31.143\r\nX-Forwarded-Host: www.somewebsite.com\r\nX-Forwarded-Server: www.somewebsite.com\r\nConnection: Keep-Alive\r\n] [HTTP/1.0 200 OK\r\nServer: Zope/(Zope 2.9.10-final, python 2.4.3, linux2) ZServer/1.1 Plone/2.5.5\r\nDate: Tue, 09 Nov 2010 06:31:20 GMT\r\nContent-Length: 75865\r\nContent-Language: en\r\nExpires: Tue, 09 Nov 2010 06:31:24 GMT\r\nVary: Accept-Encoding, Accept, X-Username\r\nLast-Modified: Fri, 28 Nov 2008 07:19:49 GMT\r\nETag: |dascalu|Plone Default|1|False|||||358134\r\nX-Caching-Rule-Id: frontpage\r\nCache-Control: max-age=5, s-maxage=3600, public\r\nContent-Type: text/html;charset=utf-8\r\nX-Header-Set-Id: cache-with-etag-in-proxy\r\nAge: 209\r\nX-Cache: HIT from squid1.somewebsite.com\r\nX-Cache-Lookup: HIT from squid1.somewebsite.com:3128\r\nVia: 1.0 squid1.somewebsite.com:3128 (squid/2.7.STABLE9)\r\nConnection: keep-alive\r\n\r] ****************** **A request from an Anonymous user (X-Username: Anonymous) will fetch a new version into the cache AND invalidate the above logged in user. The responce ETag is distinct from the logged in user (ETag: ||XXXDesign2006|1|False|||||358134) 1289284576.228 858 127.0.0.1 TCP_MISS/200 10900 GET http://127.0.0.1:3128/VirtualHostBase/http/www.somewebsite.com:80/www/SITE/VirtualHostRoot/ - FIRST_PARENT_MISS/110 text/html [Host: 127.0.0.1:3128\r\nIf-None-Match: |1|False|||||358134\r\nIf-Modified-Since: Fri, 28 Nov 2008 07:19:49 GMT\r\nAccept: text/html, image/jpeg;q=0.9, image/png;q=0.9, text/*;q=0.9, image/*;q=0.9, */*;q=0.8\r\nAccept-Encoding: x-gzip, x-deflate, gzip, deflate\r\nAccept-Charset: utf-8, utf-8;q=0.5, *;q=0.5\r\nAccept-Language: en-US, en\r\nCookie: __utmz=173508663.1289234747.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); __utma=173508663.1869602660.1289234747.1289256045.1289283795.7; __utmb=173508663.3.10.1289283795\r\nX-Username: Anonymous\r\nX-Forwarded-For: 109.99.31.143\r\nX-Forwarded-Host: www.somewebsite.com\r\nX-Forwarded-Server: www.somewebsite.com\r\nConnection: Keep-Alive\r\n] [HTTP/1.0 200 OK\r\nServer: Zope/(Zope 2.9.10-final, python 2.4.3, linux2) ZServer/1.1 Plone/2.5.5\r\nDate: Tue, 09 Nov 2010 06:36:16 GMT\r\nContent-Length: 10155\r\nContent-Language: en\r\nContent-Encoding: gzip\r\nExpires: Tue, 09 Nov 2010 06:36:20 GMT\r\nVary: Accept-Encoding, Accept, X-Username,\r\n%09Accept-Encoding\r\nLast-Modified: Fri, 28 Nov 2008 07:19:49 GMT\r\nETag: ||XXXDesign2006|1|False|||||358134\r\nX-Caching-Rule-Id: frontpage\r\nCache-Control: max-age=5, s-maxage=3600, public\r\nContent-Type: text/html;charset=utf-8\r\nX-Header-Set-Id: cache-with-etag-in-proxy\r\nX-Cache: MISS from squid1.somewebsite.com\r\nX-Cache-Lookup: MISS from squid1.somewebsite.com:3128\r\nVia: 1.0 squid1.somewebsite.com:3128 (squid/2.7.STABLE9)\r\nConnection: keep-alive\r\n\r] ***************** As a result subsequent requests from the logged in user will result in a MISS. This brakes the hole purpuse of the accelerator since anonymous and CMS users will invalidate each other's cached objects ... Please show me what am I doing wrong? Alternatively could you point me to the place in squid sources where these decisions are taken? Maybe I can better understand what I should do by looking at the code. Many thanks, Adrian
