How to trigger an Function App on Azure Relay

[rprimora]

I have successfully connected an Asp.Net Core app to the Azure Relay over a hybrid connection but now I need to run custom logic on each http request made to the relay. My idea is that all the https requests made to the Relay get passed over to the Relay Host running on the premisses. This Host in turn passes the https request to the Asp.Net Core application. Works like a charm!

Now I want to run custom logic on Relay. I want to check the request header and based on this check I will either pass the request onward or immediately return a response saying something went wrong.

How can I do this. I found numerable examples of Function App on HybridConnection endpoint but the problem is that my current Hybrid connection defined in the Relay is not available for choosing.

Is there any way to do this?

[ccompy]

App Service Hybrid Connections has a few requirements on how we integrate with the capability. You need a metadata field named endpoint that has the value of host:port. Also, requires client authorization needs to be checked when you create the hybrid connection.
We force you through that creation flow when you go into your Function or a web app, in a dedicated App Service plan, and create a Hybrid Connection from there.

[rprimora]

Do you have some kind of tutorial for setting this up because these instructions are pretty vague.

[ColbyTresness]

@alexkarcher-msft do we have a tutorial for this kind of thing?

[alexkarcher-msft]

We have a tutorial for enabling this feature in App Service. The same set of instructions will be applicable to a Function App running in an app service plan. https://docs.microsoft.com/en-us/azure/app-service/app-service-hybrid-connections#add-and-create-hybrid-connections-in-your-app

[rprimora]

Thats just a tutorial on setting up hybrid connections. It doesn't help because I've already set it up.