text: exports.handler = (event, context, callback) => {
    const response = {
      status: '200',
      statusDescription: 'OK',
      headers: {
        'cache-control': [{
          key: 'Cache-Control',
          value: 'max-age=0'
        }],
        'content-type': [{
          key: 'Content-Type',
          value: 'text/plain'
        }],
        'content-encoding': [{
          key: 'Content-Encoding',
          value: 'UTF-8'
        }],
      },
      body: (new Date).toString(),
    };
    callback(null, response);
  };
  