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From Igor Cicimov <>
Subject Re: [users@httpd] How to setup in Apache/mod_proxy an upper bound on the number of concurrent forwarded requests?
Date Tue, 06 Jul 2010 02:22:43 GMT

read the ProxyPass section.

On Tue, Jul 6, 2010 at 10:37 AM, Alessandro Vernet <> wrote:

> I have a fairly standard setup where a front-end Apache server
> forwards requests to Tomcat through mod_proxy/AJP. How can I setup
> Apache/mod_proxy so it only forwards at most N (say, N=4) concurrent
> requests to Tomcat? Other concurrent requests coming into Apache
> should not be rejected, and should instead be queued to later be sent
> to Tomcat.
> PS 1: I know this is something you can do this at the Tomcat level
> with the maxThreads attribute, but I prefer to handle this at the
> Apache level.
> PS 2: I see that Apache has a MaxClients configuration, which seems to
> be doing what I am looking for. But it is not clear to me how to have
> a MaxClient per server mod_proxy forwards to, rather than MaxClient
> per Apache. I.e. if Apache forward requests to a cluster of 4 Tomcat
> machine, I'd like Apache to limit the number of concurrent requests
> forwarded to any given Tomcat to N (say, N=4).
> Alex
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