Function newRequestWithMetadata

packages/service-worker/worker/src/assets.ts:520–549

* Create a new `Request` based on the specified URL and `RequestInit` options, preserving only * metadata that are known to be safe. * * Currently, headers, referrer, referrer policy, redirect policy, an explicit * `credentials: 'omit'`, and the HTTP cache mode are preserved. On cross-or

(url: string, options: Request)

   *   https://github.com/angular/angular/issues/41931#issuecomment-1227601347.
   */
  private newRequestWithMetadata(url: string, options: Request): Request {
    let headers = options.headers;
    const parsedUrl = this.adapter.parseUrl(url, this.adapter.origin);

    const hasHeaders = headers.keys().next().done !== true;

    if (hasHeaders && parsedUrl.origin !== this.adapter.origin) {
      headers = this.adapter.newHeaders(options.headers);
      headers.delete('Authorization');
      headers.delete('Proxy-Authorization');
      headers.delete('Cookie');
    }

    const init: RequestInit = {
      headers,
      referrer: options.referrer,
      referrerPolicy: options.referrerPolicy,
      redirect: options.redirect,
    };

    if (options.credentials === 'omit') {
      init.credentials = 'omit';
    }

    if (options.cache !== undefined) {
      init.cache = options.cache;
    }

    return this.adapter.newRequest(url, init);
  }

  /**
   * Construct a cache-busting URL for a given URL.