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From Matthew Claridge <>
Subject [users@httpd] Proxy errors
Date Thu, 11 May 2006 11:55:19 GMT

I'm seeing the following in my apache error log:

proxy: Error reading from remote server

But I'm having trouble tying it up to a request in the access log and 
also having problem diagnosing the exact fault. Can I therefore ask a 
few questions?

1. We use mod_proxy as part of a whole pile of URL rewriting we do. I 
*think* the proxy is timing out during the rewriting process, possibly 
because Apache gets busy. We also limit the bandwidth on this site so 
that might be causing the timeout. Does this seem a reasonable 
explanation? Or does anyone else have any other ideas?

2. Another possibility is that a lot of our pages make http requests to 
external services behind the scenes, before returning to the user. If 
these external services fail to respond, this may also cause the proxy 
timeout. Comments?

3. I have ProxyErrorOverride turned on, but does this error have an 
associated HTTP 1.1 status code that I can trap and then give a better 
error? I don't see anything in the access logs, but that might be 
because its trapped inside mod_rewrite.

4. When this error occurs, it doesn't seem to be either <Timeout> or 
<ProxyTimeout> after the request is made. My understanding is that this 
error occurs because the proxy times out, but which timeout value is it 
supposed to use?

Thanks in advance for any help you can give.

Matthew Claridge
Product Support Engineer
RWA Limited

Tel: 02920 815 054

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