grpc-hw

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Upstream discussion: soheilhy/cmux#64, grpc/grpc-go#2406 If you read through the cmux comments you'll see mention of a java workaround (https://github.com/soheilhy/cmux/issues/64#issuecomment-461982271), which is now needed for go as well.

Changing one line in server/main.go should do it:

-	grpcListener := m.Match(cmux.HTTP2HeaderField("content-type", "application/grpc"))
+	grpcListener := m.MatchWithWriters(cmux.HTTP2MatchHeaderFieldSendSettings("content-type", "application/grpc"))

@mpictor that works, thank you for taking the time to post it.