Let service choose it's own marshaller

[jinleileiking]

Please follow the general troubleshooting steps first:

• Update your protoc to the latest version
• Update your copy of grpc-gateway to the latest version from github. with
  git fetch https://github.com/grpc-ecosystem/grpc-gateway master && git reset --hard FETCH_HEAD
• Delete the protoc-gen-grpc-gateway and protoc-gen-swagger binary from your PATH,
  and install locally built binaries.

Bug reports:

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Steps you follow to reproduce the error:

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What did you expect to happen instead:

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What's your theory on why it isn't working:

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[johanbrandhorst]

It's possible to choose your own marshaller already with the runtime.WithMarshalerOption option: https://godoc.org/github.com/grpc-ecosystem/grpc-gateway/runtime#WithMarshalerOption.

[jinleileiking]

@johanbrandhorst I mean.

each api have its own marshaller:

/api/json ---> use jsonpb marshaller
/api/form ---> user formpb marshaller

[johanbrandhorst]

Do you want the ability to control the marshaller per-method? You could do this kind of thing with two different gRPC-Gateway servers on the same http.Server if you split traffic in a separate handler. Would that work for you?

[jinleileiking]

Do you want the ability to control the marshaller per-method?

Yes

@johanbrandhorst Can you give me an example? Thanks.