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List:       apache-httpd-bugs
Subject:    DO NOT REPLY [Bug 47095] New: Problems with pipelined HEAD
From:       bugzilla () apache ! org
Date:       2009-04-24 21:02:49
Message-ID: bug-47095-7868 () https ! issues ! apache ! org/bugzilla/
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https://issues.apache.org/bugzilla/show_bug.cgi?id=47095

           Summary: Problems with pipelined HEAD requests...
           Product: Apache httpd-2
           Version: 2.3-HEAD
          Platform: PC
        OS/Version: Mac OS X 10.4
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Core
        AssignedTo: bugs@httpd.apache.org
        ReportedBy: douglas@openplans.org


I'm gonna apologize in advance for this bug report, because while I'll give you
detailed reproduction steps, it's not a simple test case.  It will, however,
ensure you reproduce the problem.

I am running Apache 2.2 (every instance of 2.2 I try exhibits the same problem)
with mod_php running wordpress.  Inside of wordpress, I have the Xinha4WP
plugin installed (from http://oss.openplans.org/xinhatools).  In the admin
screen, Safari fails to load Xinha one out of every three times.  After much
testing, packet sniffing, etc., it seems that Xinha's new 'ping' causes Apache
to unexpectedly close connections.

Whenever the web browser is making large numbers of HEAD requests over a
pipelined connection, Apache will occasionally shut down a socket without
responding to all requests in the pipeline.  I've sniffed the traffic with
Wireshark, and the requests are all sent, most of them are responded to, and
the last three or four are completely ignored.  These ignored requests never
show up in neither access_log nor error_log, they are simply ignored.

I've just found another Apache instance that does not exhibit the problem, it's
running itk, I'm going to test to see if that's the only variable difference
that causes the problem.

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