Background: Services on Cloud Run can only expose 1 port. If you want to expose a comb

I would recommend reading <a href="https://ahmet.im/blog/grpc-http-mux-go/" rel="nofol

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Multiplexing gRPC & HTTP handlers with H2C+Prior Knowledge about cmux HOT 4 OPEN

soheilhy commented on June 22, 2024 4

Multiplexing gRPC & HTTP handlers with H2C+Prior Knowledge

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Comments (4)

howardjohn commented on June 22, 2024 2

I would recommend reading https://ahmet.im/blog/grpc-http-mux-go/, I think it addresses this

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remko commented on June 22, 2024

Hi @howardjohn . Thanks for the link. However, I wanted to avoid using ServeHTTP because it is experimental and not officially supported, and has performance issues.

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howardjohn commented on June 22, 2024

I don't think cmux can handle this. Since its a connection muxer. cloudrun (and Istio, FWIW) will multiplex gRPC and plain http2 methods onto the same connection. So if you use cmux, you might be able to get it to look like it works, but start seeing obscure failures in real world when the connections are reused. That blog was the result of us finding out that problem in prod 😛

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lukeo3o1 commented on June 22, 2024

Without knowing the code or HTTP/2, my guess from what I'm seeing is that the cmux matcher sends a http2 settings frame during negotiation, but when it still fails to match gRPC and falls back to the next 'regular' http2 handler, the http2 handler starts negotiation from scratch and sends its own settings frame, which causes problems

https://github.com/lukeo3o1/cmux/blob/677b4b20e70ac112b035428e88c80dd673af9b59/matchers.go#L252-L289

Maybe fix your guess

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