Method constructor

src/polyfills/fetch.js:245–282

* Returns instance of Response. * @param {?ResponseBodyInit=} body * @param {!ResponseInit=} init

(body, init = {})

   * @param {!ResponseInit=} init
   */
  constructor(body, init = {}) {
    const lowercasedHeaders = map();
    const data = {
      status: 200,
      statusText: 'OK',
      responseText: body ? String(body) : '',
      getResponseHeader(name) {
        const headerName = String(name).toLowerCase();
        return hasOwn(lowercasedHeaders, headerName)
          ? lowercasedHeaders[headerName]
          : null;
      },
      ...init,
    };

    data.status = init.status === undefined ? 200 : parseInt(init.status, 10);

    if (isArray(init.headers)) {
      /** @type {!Array} */ (init.headers).forEach((entry) => {
        const headerName = entry[0];
        const headerValue = entry[1];
        lowercasedHeaders[String(headerName).toLowerCase()] =
          String(headerValue);
      });
    } else if (isObject(init.headers)) {
      for (const key in init.headers) {
        lowercasedHeaders[String(key).toLowerCase()] = String(
          init.headers[key]
        );
      }
    }

    if (init.statusText) {
      data.statusText = String(init.statusText);
    }

    super(/** @type {XMLHttpRequestDef} */ (data));
  }
}

/**