Re: mod proxy hcheck not observing timeout value (Apache Users)

Hello,

I initially reported this in April 2021 and @Yann Ylavic quickly made a patch out of it. I am not sure why it didn't make it.

You can see the conversation here for reference:

https://httpd.markmail.org/message/xteh3uw53inl25gx?q=mod_proxy_hcheck+response+timeout%3F

I also agree it is a good patch and although I initially had issues with it it was probably due to some problem on my part.

Your confirmation may be good enough to validate it and propose it for next release perhaps?

Thanks for bringing this back.

Cheers

El jue, 17 nov 2022 a las 17:26, Benjamin Davis (<benjamindavis@xxxxxxxxxxxxxxx>) escribió:

Hey All,

we have apache2 2.4.54 setup as a load balancer for our IIS backend servers. We would like to be able to carry out health checks using mod_proxy_hcheck and check that the backend server is serving a webpage. We have successfully set this up however in the event that a health check request to the backend hangs, apache never reaches a timeout and therefore the healthcheck doesn't fail.

We have found a commit https://github.com/apache/httpd/commit/ab2b9dbfb74049ad207a91c45971948127dde893 that fixes this issue, we have verified this by building apache with this change applied and confirmed that when a timeout is provided in the apache balancer configuration, specifically on the BalancerMember line, the healthcheck(s) will timeout and put the backend into a failed state.

This code is not in the latest apache release, does anyone have any idea if this will be part of a future release? Or can advise regarding this issue.

Many thanks

Ben

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Ben Davis
Infrastructure Engineer

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