code: function _validateBaseUrl(url) {
          var result = "";
          // Empty url means "no server mapping; use file directly"
          if (url === "") {
              return result;
          }
  
          var obj = PathUtils.parseUrl(url);
          if (!obj) {
              result = Strings.BASEURL_ERROR_UNKNOWN_ERROR;
          } else if (obj.href.search(/^(http|https):\/\//i) !== 0) {
              result = StringUtils.format(Strings.BASEURL_ERROR_INVALID_PROTOCOL, obj.href.substring(0, obj.href.indexOf("//")));
          } else if (obj.search !== "") {
              result = StringUtils.format(Strings.BASEURL_ERROR_SEARCH_DISALLOWED, obj.search);
          } else if (obj.hash !== "") {
              result = StringUtils.format(Strings.BASEURL_ERROR_HASH_DISALLOWED, obj.hash);
          } else {
              var index = url.search(/[ \^\[\]\{\}<>\\"\?]+/);
              if (index !== -1) {
                  result = StringUtils.format(Strings.BASEURL_ERROR_INVALID_CHAR, url[index]);
              }
          }
  
          return result;
      }
docs: Validate that text string is a valid base url which should map to a server folder
  @param {string} url
  @return {string} Empty string if valid, otherwise error string