text: /**
   * Copyright 2020 Baidu Inc. All Rights Reserved.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  export default req => {
      const {type} = req.query;
      const response = new Response(`hparams\n${type}`);
      switch (type) {
          case 'tsv':
              response.headers.set('Content-Type', 'text/tab-separated-values');
              break;
          case 'csv':
              response.headers.set('Content-Type', 'text/comma-separated-values');
              break;
      }
      return response;
  };
  