How to retrieve data from a gRPC handler in HTTP middleware about grpc-gateway HOT 2 OPEN

What you're suggesting is the only way I know of to pass extra information from gRPC handlers into HTTP middleware. I don't think this is too rare of a use case (e.g., setting cookies from gRPC handlers) so I'd be interested in exploring the solution space, if you're interested in working on it.

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I'm trying to achieve something similar, I think it would be beneficial to have something like a functional interface for wrapping mux.Handle and mux.HandlePath, alternatively it would be also possible for the generated code to contain some capability of wrapping the call to mux.Handle there.

I'm trying to add support in go-http-metrics for the runtime mux, and although I can do this easily for custom methods, there are no viable alternatives of conciliating these two libraries. In my case if I went for a solution close to what @LazarenkoA has done here, it would be senseless to use go-http-metrics.

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