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From Otheus <>
Subject [users@httpd] mod gzip doesn't seem to work with proxied content
Date Fri, 06 Feb 2009 09:51:04 GMT

We are using Apache 2.0.52, 32-bit, and I have tried to enable
mod_deflate. It works for some content, but most notably, it does not
work for content that is directed via the Rewrite engine to a proxy

I am separately logging all requests that do *not* have "no-gzip"
environment variable set. Filtering through this log for the
compression ratio, I can determine which URLs are and are not
deflated.  Excluding favicons and flash files, quite a few files that
are being proxied do *not* get deflated. Why?

For instance, the following URL (prefixed with the mime/type) only
gets served through our proxies via a Java application server.

However, even some static content does not get deflated:
    text/javascript  /at/uptodate/static/5,de,SCH1/_/local.js

Some URLs that are proxied to a PHP server ARE deflated:

Is this a known issue with proxying? (CHANGE_LOGs of Apache helped me
none.) What headers might an application or proxy server generate that
would somehow disable mo_deflate WITHOUT generating the no-gzip
environment variable?


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