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From "Boyle Owen" <>
Subject RE: [users@httpd] Help debugging 500 Error
Date Fri, 15 Sep 2006 06:40:53 GMT
> -----Original Message-----
> From: Jalil Feghhi [] 
> Sent: Thursday, September 14, 2006 11:28 PM
> To:
> Subject: [users@httpd] Help debugging 500 Error
> We are using Apache 2.0.x with mod_proxy and for a specific 
> URL we get a 500 error. I check the error and access log 
> files and only see that there was an internal server error in 
> the access.log file. 

500 usually means that the request caused apache to execute some
server-sided code (eg CGI or PHP) but that the program failed. So this
will be an error in the program apache called - not in apache itself or
in any proxy.

> There is no info in error.log file that 
> helps me find out what went wrong.

Are you absolutely sure? Every error in apache (4xx or 5xx response
code) should lead to a line in the error log.. please check again
(cross-reference the timestamps) Are you sure you don't get "Premature
end of script headers"?

> I was wondering how else I can get more info why the request 
> failed. 

It depends on the server-sided logic - if it's CGI, you can get the
script output by activating ScriptLog (see docs for details). 

> I am sure the request doesn't get reverse proxied to 
> the destination web server and something happens inside Apache. 

This is correct..

But I'm wondering why a dynamic resource would end up getting proxied -
usually, you proxy requests immediately (based on the pattern of the
URL). Can you supply more details of exactly how your site works?

Owen Boyle
Disclaimer: Any disclaimer attached to this message may be ignored. 

> Any help is appreciated.
> -Jalil
> -- 
> Jalil 
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