code: public String getOpenBrowserUrl() {
          final String customUrl = getCustomBrowserUrl();
          final String deployUrl = getDeployUrl();
          if (customUrl == null) {
              return deployUrl;
          } else if (customUrl.startsWith("http://")) {
              return customUrl;
          } else if (customUrl.startsWith("/")) {
              return buildUrl(getPort(), customUrl);
          } else {
              return deployUrl + customUrl;
          }
      }
docs: Returns the url to use when the browser opens, according to both the deploy url
  and a custom browser url, if set.
  
  @return the url to use when to open the browser