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From Nick Kew <>
Subject Re: proxy health checks [was: Proxying OPTIONS *]
Date Wed, 03 Oct 2007 13:42:01 GMT
On Wed, 03 Oct 2007 15:04:52 +0200
Rainer Jung <> wrote:

> It would be nice to have the health check running asynchronously from 
> the normal request handling (error detection for idle connections, 
> before requests fail). Even more important, the recovery test could
> be done independently from request handling.

Indeed.  That could apply to other backends (such as mod_dbd) too.

> For this one would need some scheduling service (independent threads, 
> API extension for callbacks). A simple start could be something like
> the monitor() hook. Although that one depends on the type of MPM and
> the module scheduling service should not be decoupled from the timing
> of important internal procedures.

Patches welcome!

Maybe a scheduled event thread could be a standard feature for httpd-3,
to make this kind of thing straightforward.

Nick Kew

Application Development with Apache - the Apache Modules Book

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