[users@httpd] Apache 2.0.54 unable to read long POST requests

["Tuomas J Rinta" <trinta@xxxxxxxxxxxxxx>]

I'm running Apache 2.0.54 (Server signature: Apache/2.0.54 (Unix) PHP/4.4.0) 
on Linux 2.6.10 (running on a Xen virtual server). Currently I'm facing an 
odd problem where long POST-requests end up creating a "400 Bad request" 
response to the client. I'm running a weblog-service on the server and when 
an user posts a blog-entry, the saving of the request will fail if the post 
is long (I haven't been unable to pinpoint the exact length where it will 
fail). 

The error message that is generated in the error_log is:
[Tue Sep 06 22:01:42 2005] [error] [client <removed>] request failed: error 
reading the headers, referer: http://vuodatus.net/site/control/editblog 

It took me a while to actually even find the error message as the 
weblog-site is running as a virtual host and the request actually goes to 
the default website in the httpd.conf as the Host-header from the request 
disappears. 

The odd thing is that it seems that this isn't happening for everybody, just 
some so I feel like I should point a blaming finger at some ISP's but I am 
currently not sure. Does anybody know if some error or misconfiguration in 
Apache could be causing this? 

Thanks,
Tuomas Rinta

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