The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#) https://grpc.io/
 
 
 
 
 
 
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README.md

An example showing how to add custom HTTP2 headers (or metadata in gRPC glossary)

HTTP2 supports initial headers and trailing headers, which gRPC utilizes both of them (learn more).

More complete documentation lives at grpc.io. For API reference please see API.