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From "Nikolaus Schmitt" <n.schm...@scaet.de>
Subject Re: [users@httpd] Precise cause for error
Date Tue, 11 Nov 2003 19:03:32 GMT
Hi Quint,

configure apache to dump any requests and responses including the headers
into one file (see section Logging in the manuals). Alternatively, you can
use a network tracer such as etherreal to fetch all communication traffic
between the apache proxy front and the backend systems. The trace will help
to make buggy / abnormal responses transparent to both admins and
developers. Most times it seems to be faster for me to make a trace, than to
sort out thousands of log lines from different systems.

A cgi programm that sometimes sends a duplicate HTTP status (= header)
>>>might<<< suffer from race conditions within the code.

Regards
Niko

----- Original Message -----
From: "Quint Van Deman" <Quint.VanDeman@S1.com>
To: <users@httpd.apache.org>
Sent: Tuesday, November 11, 2003 7:57 PM
Subject: [users@httpd] Precise cause for error


> Hi all--
>
> Can anyone explain the situations under with this error might be generated
> by mod_proxy:
>
> [Tue Nov 11 10:34:17 2003] [warn] proxy: THIS IS THE PROBLEM ERROR :
> Ignoring du
> plicate HTTP status line returned by buggy server /3.5/cgi-bin/hb.exe
(POST)
>
> I know the application is doing something strange, I'd just like to be
able
> to point the developer in the right direction.
> If nothing else, does anyone have any suggestions on how to narrow in on
the
> problem?
>
> Basic environment specs:
> Reverse Proxy - Apache 1.3.27/Redhat 7.2
> Backend application - miserable CGI/IIS/NT4
>
> Thanks,
>
> Quint
>
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