[cyberpunk]

And still none of these do protobuf/grpc/http2 properly.

I had to MITM some grpc service a while ago to develop a replacement for it and it was basically impossible in the end. MITMProxy got the closest, but it couldn't decode the protobufs.

I'd pay for any tool which could do that; if it existed.

[ev_dev3]

If you're willing to, would you get in touch over email? I'm curious to learn more about your use case. My email is in my HN profile.

Trayce lets you import your .proto file to properly parse grpc messages.