Kai-Chieh Ku wrote:
Hello,
I just setup a reverse proxy. But I noticed squid always send
conditional requests to the backend server even its local cache
contains the fresh data. The response headers looks like this:
--
HTTP/1.0 200 OK
Last-Modified: Wed, 17 03 2010 08:26:15 GMT
Cache-Control: max-age=86400
Content-Type: text/plain
X-Cache: MISS from ku-office
X-Cache-Lookup: HIT from ku-office:81
Via: 1.0 ku-office:81 (squid/2.7.STABLE8)
Connection: close
--
The backend server listened on port 80 and squid listened on port 81.
And my settings of squid are:
--
http_port 81 vport=80 defaultsite=localhost
cache_peer 127.0.0.1 parent 80 0 no-query no-digest originserver
refresh_pattern . 0 20% 4320
--
I'd like to let squid make the conditional request only when the cache
entry is expired. What am I missing?
... very twisted.
You have squid listening on pot 81 for requests to
http://localhost:80/something
Take a read through this:
http://wiki.squid-cache.org/ConfigExamples/Reverse/BasicAccelerator
As for the backend queries, you show no evidence that they are happening
at all. The reply you show has bee updated with current origin info.
there is no sign of what it was when squid received the client request.
check access.log for TCP_HIT (exactly), these are true cache hits. The
others all needed to be updated due to data aging out.
Amos
--
Please be using
Current Stable Squid 2.7.STABLE8 or 3.0.STABLE25
Current Beta Squid 3.1.0.18
