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HAProxy 1.7 have a very nice feature called Stream Processing Offload Engine (SPOE).

This feature makes it possible to handle some expensive checks in a dedicated external process or on a server(-farm).

The full documentation can be found here.

Due to the fact that I like the visual presentation of such a process I have created a picture how the SPOE works.


It looks a little bit complicated but when you have understand the concept behind the SPOE you will see that this could be a very powerful tool.

You can contact me for any further questions and orders