I am defining a gRPC service that conceptually takes a large one-time set 
of parameters, then a stream of short messages and returns result at the 

My head-first attempt to define such a thing failed with a syntax error 
message at the comma:

  rpc Recognize(RecognizeRequest, stream Frame) returns (RecognizeReply) {}

How do I achieve what I want? Indeed, I went through the route_guide 
example (https://github.com/grpc/grpc-common/tree/master/cpp/route_guide), 
but it does not have a one-time setup.


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