code: function filterByMethods(req) {
          if(_config.allowedMethods) {
              return _config.allowedMethods.indexOf(req.method) > -1;
          } else if(_config.blockedMethods){
              return !(_config.blockedMethods.indexOf(req.method) > -1);
          } else {
              return true;
          }
      }
docs: This Method checks by configured black or whitelist, if the REST-Method is allowed or not
  If no black or whitelist exists it allows method by default
  @param req
  @returns {boolean}