How can I diagnose cache misses when using Apache as a reverse proxy?

Posted by johnstok on Server Fault See other posts from Server Fault or by johnstok
Published on 2010-03-16T15:39:04Z Indexed on 2010/03/16 15:41 UTC
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Filed under:

apache

|

mod-cache

|

mod-proxy

I have set up Apache 2.2 as a reverse proxy with the following configuration:

# jBoss proxying
    ProxyRequests Off
    <Proxy *>
            Order deny,allow
            Allow from all
    </Proxy>

    ProxyPass /foo http://localhost:9080/foo
    ProxyPassReverse /foo http://localhost:9080/foo
    ProxyPassReverseCookiePath /foo /foo

# Reverse proxy caching
    CacheEnable disk /foo

# Compression
    SetOutputFilter DEFLATE
    BrowserMatch ^Mozilla/4 gzip-only-text/html
    BrowserMatch ^Mozilla/4\.0[678] no-gzip
    BrowserMatch \bMSIE\s(7|8) !no-gzip !gzip-only-text/html
    DeflateCompressionLevel 9
    Header append Vary User-Agent env=!dont-vary

However, in a number of cases where I expect a cached response to be returned the request is sent through to the origin server at localhost:9080. Responses have a HTTP Vary header of 'Accept-Encoding,User-Agent' which is to be expected given the mod_deflate configuration.

How can I determine why Apache is unable to serve a response from the cache?

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