code: func StaticResponder(res string) func() *http.Response {
  	_, err := http.ReadResponse(bufio.NewReader(strings.NewReader(res)), nil)
  	if err != nil {
  		panic("Invalid response given to StaticResponder: " + err.Error())
  	}
  	return func() *http.Response {
  		res, _ := http.ReadResponse(bufio.NewReader(strings.NewReader(res)), nil)
  		return res
  	}
  }
docs: // StaticResponder returns an HTTP response generator that parses res
  // for an entire HTTP response, including headers and body.