grpc  1.39.0
About: gRPC is a modern C based remote procedure call (RPC) framework (for C++, Python, Ruby, Objective-C, PHP, C#).
  Fossies Dox: grpc-1.39.0.tar.gz  ("unofficial" and yet experimental doxygen-generated source code documentation)  

GRPC Core

The GRPC Core library is a low-level library designed to be wrapped by higher level libraries. The top-level API is provided in grpc.h. Security related functionality lives in grpc_security.h.