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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 39499] New: - error reading status line, reverse proxy, broken pipe
Date Sat, 06 May 2006 13:18:31 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=39499

           Summary: error reading status line, reverse proxy, broken pipe
           Product: Apache httpd-2
           Version: 2.2.2
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Core
        AssignedTo: bugs@httpd.apache.org
        ReportedBy: japs@adm.ku.dk


I am running a reverse proxy server. Since I upgraded to Apache 2.2.0
(and 2.2.2) I have had a lot of errors: "error reading status line"

The relevant part of the config file is:

<VirtualHost *:80>
    ServerName  www.ku.dk
ProxyPass             /   http://malamute.adm.ku.dk/
ProxyPassReverse      /   http://malamute.adm.ku.dk/
</VirtualHost>

With "debug" I get the following error_log:

[Sat May 06 13:52:12 2006] [debug] mod_proxy_http.c(54): proxy: HTTP: 
canonicalising URL //malamute.adm.ku.dk/net
[Sat May 06 13:52:12 2006] [debug] proxy_util.c(1378): [client 
2001:878:100:14::134] proxy: http: found worker http://malamute.adm.ku.dk/ for 
http://malamute.adm.ku.dk/net
[Sat May 06 13:52:12 2006] [debug] mod_proxy.c(756): Running scheme http 
handler (attempt 0)
[Sat May 06 13:52:12 2006] [debug] mod_proxy_http.c(1662): proxy: HTTP: 
serving URL http://malamute.adm.ku.dk/net
[Sat May 06 13:52:12 2006] [debug] proxy_util.c(1798): proxy: HTTP: has 
acquired connection for (malamute.adm.ku.dk)
[Sat May 06 13:52:12 2006] [debug] proxy_util.c(1858): proxy: connecting 
http://malamute.adm.ku.dk/net to malamute.adm.ku.dk:80
[Sat May 06 13:52:12 2006] [debug] proxy_util.c(1951): proxy: connected /net 
to malamute.adm.ku.dk:80
[Sat May 06 13:52:12 2006] [debug] proxy_util.c(2141): proxy: HTTP: connection 
complete to 130.225.126.178:80 (malamute.adm.ku.dk)
[Sat May 06 13:52:12 2006] [info] [client 130.225.126.178] (32)Broken pipe: 
core_output_filter: writing data to the network
[Sat May 06 13:52:12 2006] [error] [client 2001:878:100:14::134] proxy: error 
reading status line from remote server malamute.adm.ku.dk
[Sat May 06 13:52:12 2006] [error] [client 2001:878:100:14::134] proxy: Error 
reading from remote server returned by /net
[Sat May 06 13:52:12 2006] [debug] proxy_util.c(1816): proxy: HTTP: has 
released connection for (malamute.adm.ku.dk)

Here I have used IPv6 between the client and proxy server, and IPv4 between 
the proxy server and the backend server. However, I observe the same error 
with pure IPv4.

The error occur very often (every 2-5 minutes) during light load of the proxy 
server. During moderate load the error is very seldom (every 60-120 minutes).

Linux proxy4.adm.ku.dk 2.6.12-18mdk #1 Wed Mar 15 13:15:23 MST 2006 i686 Intel
(R) Pentium(R) 4 CPU 3.20GHz unknown GNU/Linux

Jan P. Sorensen

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