Hi all -  I will use meta-data to mean generic information that is
usually sent and received besides the request/response.

So far this is what i think is the case:
(Referring to 
https://github.com/grpc/grpc-go/blob/master/Documentation/grpc-metadata.md)

- For clients to send any kind of meta-data, use context + metadata to
create a new context
- For servers to send back any kind of meta use, header and trailers,
which the client can access using Header and Trailer Call Options.

Is there any reason why this is so - why couldn't we use the Header
(and Trailers) to send the meta-data to the server as well instead of
creating a new context?

Thanks,
Amit.

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