> In general dynamic pages should be cachable. There are two cases known to > me where that is false. > > a) page is dynamic, without cache-control info and meant to be non-cachable. > > This is the reason we add the 0 0% 0 refresh pattern to replace the old > QUERY acl. It means consider all indeterminate dynamic requests as > non-cacheble. Just to be safe. > > b) the page is one of the above but has been passed to a peer by squid. > > This is our fault, squid adds an otherwise unnoticeable cache-control > header to requests passed in peering. This breaks the refresh_pattern > safety check for (a). > > None yet has coded the patch for (b). So dynamic caching works in squid, > but not on requests received from peers. Aha, thanks for the info. I added this ACL to curb ICP requests: acl swf urlpath_regex clown_widget.swf icp_access deny swf And now there are corresponding UDP_DENIED msgs: 22/Aug/2008:01:40:24 -0700.049 0 110.0.2.78 UDP_DENIED/000 88 ICP_QUERY http://contentreal.foobar.com/clown_widget.swf?version=20080820 - NONE/- - But requests still occasionally timeout: [root@mongo ~]# wget -S http://content5.foobar.com/clown_widget.swf?version=20080820 --03:38:07-- http://content5.foobar.com/clown_widget.swf?version=20080820 => `clown_widget.swf?version=20080820' HTTP request sent, awaiting response... HTTP/1.0 200 OK Last-Modified: Fri, 08 Aug 2008 06:07:10 GMT Accept-Ranges: bytes Content-Length: 219919 Content-Type: application/x-shockwave-flash Date: Fri, 22 Aug 2008 12:28:44 GMT Server: Apache ETag: "35b0f" Expires: Sat, 23 Aug 2008 12:28:44 GMT Cache-Control: max-age=86400 X-Cache: HIT from squid04.foobar.com X-Cache-Lookup: HIT from squid04.foobar.com:80 Age: 567 X-Cache: HIT from squid01.foobar.com X-Cache-Lookup: HIT from squid01.foobar.com:80 Via: 1.1 squid04.foobar.com:80 (squid), 1.0 squid01.foobar.com:80 (squid) Connection: keep-alive Length: 219,919 (215K) [application/x-shockwave-flash] 16% [=====> ] 35,664 --.--K/s ETA 00:20 22/Aug/2008:05:33:31 -0700.843 279168 65.0.22.251 TCP_MISS/200 161676 GET http://contentreal.foobar.com/clown_widget.swf?version=20080820 - CD_SIBLING_HIT/110.0.2.78 application/x-shockwave-flash Looks like digest hits are still wreaking havoc? Anyone know of any workarounds aside from removing sibling/parent relationships?
