The files contained in this folder are Wireshark capture files. Each of them show the logs for different types of gRPC API. Their purpose is to illustrate the HTTP/2 protocol used by gRPC. You can view the captures in Wireshark by changing the HTTP/2 protocol TCP port to 50051 (Mac: Preferences > Protocols > HTTP2 > TCP port(s), Linux/Windows: Settings > Protocols > HTTP2 > TCP port(s)), opening them (File > Open), and adding the following display filter:
tcp.port == 50051 and (grpc or http2)