async _loadNetworkResource(url) {
    const frameTreeResponse = await this.session.sendCommand('Page.getFrameTree');
    const networkResponse = await this.session.sendCommand('Network.loadNetworkResource', {
      frameId: frameTreeResponse.frameTree.frame.id,
      url,
      options: {
        disableCache: true,
        includeCredentials: true,
      },
    });

    return {
      stream: networkResponse.resource.success ? (networkResponse.resource.stream || null) : null,
      status: networkResponse.resource.httpStatusCode || null,
    };
  }
@param {string} url
@return {Promise<{stream: LH.Crdp.IO.StreamHandle|null, status: number|null}>}