Dear Colleagues, When updating several almost identical FreeBSD hosts via a squid-3.5.27 proxy, I expect to see lots of HITs, because the patches on the update server should be identical too. However, I see lots of TCP_REFRESH_UNMODIFIED lines, and only occasional HIT statuses. Please see the log excerpt at the end of the message, and the example exchange between client and squid. From the squid documentation I figure out that a TCP_REFRESH_UNMODIFIED status means that there was an IMS request involved. But I don't understand who made this IMS request: client to squid or squid to the webserver. The "fetch" HTTP client the freebsd-update utility uses is rather dumb and does not send IMS requests (also see below). Could someone please explain what is happening here? The HTTP replies from the squid cache to the HTTP client are "X-Cache-Lookup: MISS from proxy2.sibptus.ru:8080", so these TCP_REFRESH_UNMODIFIED statuses seem to be really MISSes and I'm not saving traffic on these updates. 1507630624.673 389 212.73.124.12 TCP_REFRESH_UNMODIFIED/200 572 GET http://update6.freebsd.org/to-10.4-RELEASE/i386/bp/82a25f03517d9d65b3c0af22f77ed9cbe94d09f1af6f4cd835a93b5f191122dc-63836fc812fc7b03a2ad1d2df9c59dde3178e1eaf4d0e32342a8a04a7121ac6d - HIER_DIRECT/198.148.79.66 application/octet-stream 1507630625.067 394 212.73.124.12 TCP_REFRESH_UNMODIFIED/200 574 GET http://update6.freebsd.org/to-10.4-RELEASE/i386/bp/584713682ac3cc86fd2bfb7edbb9030aa48efbf027465ebcce705864310140af-0981c929f128ad067d3c8c577f9c84302523e24548b561edceee28a3357a5007 - HIER_DIRECT/198.148.79.66 application/octet-stream 1507630625.515 448 212.73.124.12 TCP_REFRESH_UNMODIFIED/200 980593 GET http://update6.freebsd.org/to-10.4-RELEASE/i386/bp/1195d725efce75f0db6317f507d8a9514f35613c7466673a86db23100bd6fa77-c4150431df5b14b15546b3db5e30f2bd2c35d6d52812f057dc101fab20847324 - HIER_DIRECT/198.148.79.66 application/octet-stream 1507630625.914 399 212.73.124.12 TCP_REFRESH_UNMODIFIED/200 532 GET http://update6.freebsd.org/to-10.4-RELEASE/i386/bp/aac782643cbfaad218bf72f037624af304d353f2a12fb6a5eeb117cdd6c9bc27-2f6df820f68859d2e86a8f45777a81a7186477048893456f891fd91dae19af3b - HIER_DIRECT/198.148.79.66 application/octet-stream 1507630625.948 33 212.73.124.12 TCP_HIT/200 980593 GET http://update6.freebsd.org/to-10.4-RELEASE/i386/bp/1195d725efce75f0db6317f507d8a9514f35613c7466673a86db23100bd6fa77-c4150431df5b14b15546b3db5e30f2bd2c35d6d52812f057dc101fab20847324 - HIER_NONE/- application/octet-stream 1507630626.354 406 212.73.124.12 TCP_REFRESH_UNMODIFIED/200 531 GET http://update6.freebsd.org/to-10.4-RELEASE/i386/bp/58764b03f019f1aa9e28e24ddb9e74abf323cfc3984bd899accf7b15bb2a6462-6d53fae808e6d79c6c251f6b1fe5e26fbd84e191f84900bcf01931d49855249f - HIER_DIRECT/198.148.79.66 application/octet-stream 1507630626.391 36 212.73.124.12 TCP_HIT/200 980593 GET http://update6.freebsd.org/to-10.4-RELEASE/i386/bp/1195d725efce75f0db6317f507d8a9514f35613c7466673a86db23100bd6fa77-c4150431df5b14b15546b3db5e30f2bd2c35d6d52812f057dc101fab20847324 - HIER_NONE/- application/octet-stream 1507630626.391 0 212.73.124.12 TCP_MEM_HIT/200 527 GET http://update6.freebsd.org/to-10.4-RELEASE/i386/bp/1af4cec823d8b1f42c3b8a58ec0da40bfc2f97efacd92e7758096eba081e08db-2ac8890502bc272d65f2b7dd73fa7def11fa4d3feb2005b82b58ba43747b57e4 - HIER_NONE/- application/octet-stream 1507630626.785 393 212.73.124.12 TCP_REFRESH_UNMODIFIED/200 697 GET http://update6.freebsd.org/to-10.4-RELEASE/i386/bp/6c0eae2981826e2033797003f53aedba9adb7e317c936f6923912e5df2627216-341717a9aa21a95b7f9f83e29ac3de1cac6b9d58700ece767e4ab7cd028105c9 - HIER_DIRECT/198.148.79.66 application/octet-stream 1507630627.184 399 212.73.124.12 TCP_REFRESH_UNMODIFIED/200 1001 GET http://update6.freebsd.org/to-10.4-RELEASE/i386/bp/6f486e6baa2d057fa16d3fa43e666917ab9d045de2e59a7d05ace758c7d03373-653636793fd95f406da85e1375acd38f31b6c39c404b18cd8e0a641a2deb6065 - HIER_DIRECT/198.148.79.66 application/octet-stream 1507630627.577 392 212.73.124.12 TCP_REFRESH_UNMODIFIED/200 674 GET http://update6.freebsd.org/to-10.4-RELEASE/i386/bp/3c78173d804b5299f24199a125b3c52145c7e7680c97debb051d823526ae0579-595c12cd31ef1c4d084c308b7278d28bbb844873da246d88fb02db90f90b88b9 - HIER_DIRECT/198.148.79.66 application/octet-stream 1507630627.967 389 212.73.124.12 TCP_REFRESH_UNMODIFIED/200 1193 GET http://update6.freebsd.org/to-10.4-RELEASE/i386/bp/cc4d2e70a2c12900362eba48bae5fa8388bfd8ed9975246578d5c68fd00fb9b3-74473c002b6e269ddb7b3c385cfff0f43b4fcbf1dcba7f36dac7c7918b19f8a9 - HIER_DIRECT/198.148.79.66 application/octet-stream 1507630628.357 391 212.73.124.12 TCP_REFRESH_UNMODIFIED/200 29745 GET http://update6.freebsd.org/to-10.4-RELEASE/i386/bp/2f0861149594653c2b91faec675aef008728c5ba13b352ca3877714a40bffbd6-e6b495c0d23d7eb5fe43bb07e5a8a71f3bad37844a0e8a121ef2178e5fd6ca4a - HIER_DIRECT/198.148.79.66 application/octet-stream GET http://update.FreeBSD.org/to-10.4-RELEASE/i386/bp/4b363ee1c1e681fe5a67dd7201062ee1977f1437ce9de7c7bc9c9b84839f10df-6dc4edca0bcab3f4b0ae59d1a2714aeb0df22fce043c8897079ab9914fdafbf4 HTTP/1.1 Host: update.FreeBSD.org User-Agent: freebsd-update (upgrade, 10.3-RELEASE-p20) Connection: Keep-Alive HTTP/1.1 200 OK Date: Wed, 11 Oct 2017 01:38:16 GMT Server: Apache/2.2.16 (FreeBSD) mod_ssl/2.2.16 OpenSSL/0.9.8n DAV/2 Last-Modified: Sun, 01 Oct 2017 19:32:05 GMT ETag: "1f0c0de-951-55a81501e5740" Accept-Ranges: bytes Content-Length: 2385 Content-Type: text/plain X-Cache: MISS from proxy2.sibptus.ru X-Cache-Lookup: MISS from proxy2.sibptus.ru:8080 Via: 1.1 proxy2.sibptus.ru (squid/3.5.27) Connection: keep-alive BSDIFF40....... -- Victor Sudakov, VAS4-RIPE, VAS47-RIPN AS43859 _______________________________________________ squid-users mailing list squid-users@xxxxxxxxxxxxxxxxxxxxx http://lists.squid-cache.org/listinfo/squid-users
