Function grpcio_sys::grpc_server_add_insecure_http2_port

pub unsafe extern "C" fn grpc_server_add_insecure_http2_port(
    server: *mut grpc_server, 
    addr: *const c_char
) -> c_int

Add a HTTP2 over plaintext over tcp listener. Returns bound port number on success, 0 on failure. REQUIRES: server not started