Function fromStructuredCloneable

src/utils/xhr-utils.js:118–162

(response, responseType)

 * @private
 */
export function fromStructuredCloneable(response, responseType) {
  userAssert(isObject(response), 'Object expected: %s', response);

  const isDocumentType = responseType == 'document';
  if (!isDocumentType) {
    // Use native `Response` type if available for performance. If response
    // type is `document`, we must fall back to `FetchResponse` polyfill
    // because callers would then rely on the `responseXML` property being
    // present, which is not supported by the Response type.
    return new Response(response['body'], response['init']);
  }

  const lowercasedHeaders = map();
  const data = {
    status: 200,
    statusText: 'OK',
    /**
     * @param {string} name
     * @return {string}
     */
    getResponseHeader(name) {
      return lowercasedHeaders[String(name).toLowerCase()] || null;
    },
  };

  if (response['init']) {
    const init = response['init'];
    if (isArray(init.headers)) {
      /** @type {!Array} */ (init.headers).forEach((entry) => {
        const headerName = entry[0];
        const headerValue = entry[1];
        lowercasedHeaders[String(headerName).toLowerCase()] =
          String(headerValue);
      });
    }
    if (init.status) {
      data.status = parseInt(init.status, 10);
    }
    if (init.statusText) {
      data.statusText = String(init.statusText);
    }
  }

  return new Response(response['body'] ? String(response['body']) : '', data);
}

/**
 * Intercepts the XHR and proxies it through the viewer if necessary.