code: function(datasetId, params, callback) {
        var interceptor = requestInterceptors[datasetId] || defaults.requestInterceptor;
        return interceptor(datasetId, params, callback);
      }
docs: Can be used to check the request parameters or perform authentication checks
  @param {String} datasetId
  @param {Object} params
  @param {Object} params.query_params
  @param {Object} params.meta_data
  @param {Function} callback