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                        grpc: specific content type
Describe the bug
Currently, content type for grpc are being set via our interceptor to application/grpc. While this conform with gRPC standard, this is not really useful for sysadmin. We should specify the correct CONTENT_TYPE for any given request.
Currently each io descriptor as _rpc_content_type, this should be specific to each IO descriptor.
Access log should use this to determine the appropriate content-type