• GRPCCompressAlgorithm : GRPCTypes.h
• GRPCMetadataDictionary : GRPCTypes.h
• GRXCompletionHandler : GRXWriteable.h
• GRXEventHandler : GRXWriteable.h
• GRXSingleHandler : GRXWriteable.h
• GRXValueHandler : GRXWriteable.h
• stream_engine : GRPCCall+Cronet.h