code: function _cmdWriteFilteredResponse(root, path, resData) {
      var pathKey  = getPathKey(root),
          callback = _requests[pathKey][resData.id];
  
      if (callback) {
          callback(resData);
      } else {
          console.warn("writeFilteredResponse: Missing callback for %s. This command must only be called after a requestFilter event has fired for a path.", pathJoin(root, path));
      }
  }
docs: @private
  Overrides the server response from static middleware with the provided
  response data. This should be called only in response to a filtered request.
  
  @param {string} path The absolute path of the server
  @param {string} root The relative path of the file beginning with a forward slash "/"
  @param {!Object} resData Response data to use