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Date: 6 Feb 2004 16:37:19 -0000
Message-ID: <20040206163719.23194.qmail@nagoya.betaversion.org>
From: bugzilla@apache.org
To: bugs@httpd.apache.org
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Subject: DO NOT REPLY [Bug 26731] New:  -
    mod_proxy won't cache if last-modified is missing,
 even if Expires: is valid

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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=26731

mod_proxy won't cache if last-modified is missing, even if Expires: is valid

           Summary: mod_proxy won't cache if last-modified is missing, even
                    if Expires: is valid
           Product: Apache httpd-1.3
           Version: 1.3.29
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: Other
         Component: mod_proxy
        AssignedTo: bugs@httpd.apache.org
        ReportedBy: boutell@boutell.com


There is a straightforward fix for this. Apologies for the informal patch, but
you'll find it in mod_cache.c right away by searching for the line before my
"TBB" comment. The last line below is the actual code change.

With this simple modification, mod_expires can be used on a back-end server in
conjunction with mod_proxy on the front end server to greatly reduce load on the
back end for URLs that aren't obviously static (but the designer knows they are
and has chosen to use mod_expires, which mod_proxy ought to honor).

Thanks.

    /*
     * 200 OK response from HTTP/1.0 and up without a Last-Modified header
     * TBB 02/06/04: an Expires header is also acceptable.                     
            */                                                                 
               (r->status == HTTP_OK && ((lmods == NULL) && (expire == NULL)) &&
is_HTTP1) ||

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