// fetchWireResponse is a helper for dialing to host,
// sending http1ReqBody as the payload and retrieving
// the response as it was sent on the wire.
func fetchWireResponse(host string, http1ReqBody []byte) ([]byte, error) {
	conn, err := net.Dial("tcp", host)
	if err != nil {
		return nil, err
	}
	defer conn.Close()

	if _, err := conn.Write(http1ReqBody); err != nil {
		return nil, err
	}