go http timeout设置

handler := ...
srv := &http.Server{
	Addr:              fmt.Sprintf("%s:%d", "", 9888),
	Handler:           handler,
	ReadHeaderTimeout: 5 * time.Second,
	ReadTimeout:       10 * time.Second,
	WriteTimeout:      35 * time.Second,
	// https://cloud.google.com/load-balancing/docs/https/request-distribution#timeout-bes
	IdleTimeout: 620 * time.Second,
}
srv.Protocols = new(http.Protocols)
srv.Protocols.SetHTTP1(true)
srv.Protocols.SetUnencryptedHTTP2(true)