Hi everyone! I'm running a reverse proxy (1) to help my httpd to serve content fast and avoid going to the origin as much as possible. Doing that, I found I made a _lot_ of TCP_REFRESH_HIT requests to origin, although I've an insane 10-year-long expiration date set on my http response headers back to squid. Although I did verify that, using wget -S and some fancies tcpdump lines, I wanted to get rid of any TCP_REFRESH_HIT request, main reason is because there's no way some objects change, so requesting for freshness has no sense moreover increases server load (1/7 are refresh_hit's). I used refresh_pattern with override-expire and extremely high values for min and max values, with absolutely no effect. For the record, If I use offline_mode I obtain partially what I wanted, unfortunately I loose the flexibility of the regex capacity that refresh_pattern has, which I need for avoiding special objects. I've enabled debug for a blink of an eye, and got a request that goes as TCP_REFRESH_HIT, and as for what I understand, appears to be answered as being stale and requested back to origin. 2010/07/14 13:35:58| parseHttpRequest: Complete request received 2010/07/14 13:35:58| removing 1462 bytes; conn->in.offset = 0 2010/07/14 13:35:58| clientSetKeepaliveFlag: http_ver = 1.0 2010/07/14 13:35:58| clientSetKeepaliveFlag: method = GET 2010/07/14 13:35:58| clientRedirectStart: 'http://foobar.com/object' 2010/07/14 13:35:58| clientRedirectDone: 'http://foobar.com/object' result=NULL 2010/07/14 13:35:58| clientInterpretRequestHeaders: REQ_NOCACHE = NOT SET 2010/07/14 13:35:58| clientInterpretRequestHeaders: REQ_CACHABLE = SET 2010/07/14 13:35:58| clientInterpretRequestHeaders: REQ_HIERARCHICAL = SET 2010/07/14 13:35:58| clientProcessRequest: GET 'http://foobar.com/object' 2010/07/14 13:35:58| clientProcessRequest2: storeGet() MISS 2010/07/14 13:35:58| clientProcessRequest: TCP_MISS for 'http://foobar.com/object' 2010/07/14 13:35:58| clientProcessMiss: 'GET http://foobar.com/object' 2010/07/14 13:35:58| clientCacheHit: http://foobar.com/object = 200 2010/07/14 13:35:58| clientCacheHit: refreshCheckHTTPStale returned 1 2010/07/14 13:35:58| clientCacheHit: in refreshCheck() block 2010/07/14 13:35:58| clientProcessExpired: 'http://foobar.com/object' 2010/07/14 13:35:58| clientProcessExpired: lastmod -1 2010/07/14 13:35:58| clientReadRequest: FD 84: reading request... 2010/07/14 13:35:58| parseHttpRequest: Method is 'GET' 2010/07/14 13:35:58| parseHttpRequest: URI is '/object' In the way of checking anything to get some effect, I also gived a try to ignore-stale-while-revalidate override-lastmod override-expire ignore-reload ignore-no-cache, pushed refresh_stale_hit high in the sky, and again, no effects :-( What I'm doing wrong? Is there any other way to avoid REFRESH_HITs from being performed? Greetings, Dererk ref: 1. Squid Cache: Version 2.7.STABLE7 configure options: '--prefix=/usr/local/squid' '--bindir=/usr/local/bin' '--sbindir=/usr/local/sbin' '--sysconfdir=/etc/squid' '--localstatedir=/var' '--mandir=/usr/local/man' '--infodir=/usr/local/info' '--disable-internal-dns' '--enable-async-io' '--enable-storeio=aufs,ufs,coss' '--with-large-files' '--enable-snmp' '--with-maxfd=8192' '--enable-htcp' '--enable-cache-digests'
