code: func (b TestToBuildData) ServeHTTP(res http.ResponseWriter, req *http.Request) {
  	data, err := json.Marshal(b)
  	if err != nil {
  		res.Header().Set("Content-type", "text/html")
  		res.WriteHeader(http.StatusInternalServerError)
  		res.Write([]byte(fmt.Sprintf("<h3>Internal Error</h3><p>%v", err)))
  		return
  	}
  	res.Header().Set("Content-type", "application/json")
  	res.WriteHeader(http.StatusOK)
  	res.Write(data)
  }
docs: // ServeHTTP is the HTTP handler for serving TestToBuildData.