Alternative messageType header
Description
Hi, from my investigations, it seems that it's difficult to set ; messageType=mypackage.MyMessageType in connect-go:
https://github.com/connectrpc/connect-go/issues/847
If messageType would be an alternative header, this would be much easier to do.
Also, application/grpc is the Content-Type used by connect-go
Why this feature/change is important?
Help mobile devs understand the rpc calls quickly, without configuring each different rpc.
Reading further, there has been some debate about which Content-Type header is right for grpc:
https://github.com/grpc/grpc/issues/36765
This is concerning the +xyz extension to application/grpc. An alternative header, like Proxyman-Protobuf-Message-Type or something would make sense to me.
You can define your own Message Type for each URL. Here is the doc: https://docs.proxyman.com/advanced-features/protobuf
THe MessageType header is just an automatic way. You can manually create it.