Method handleServe

packages/angular/ssr/src/app.ts:229–267

* Handles serving a prerendered static asset if available for the matched route. * * This method only supports `GET` and `HEAD` requests. * * @param request - The incoming HTTP request for serving a static page. * @param matchedRoute - The metadata of the matched route for rendering.

(
    request: Request,
    matchedRoute: RouteTreeNodeMetadata,
  )

   * @returns A promise that resolves to a `Response` object if the prerendered page is found, or `null`.
   */
  private async handleServe(
    request: Request,
    matchedRoute: RouteTreeNodeMetadata,
  ): Promise<Response | null> {
    const { headers, renderMode } = matchedRoute;
    if (renderMode !== RenderMode.Prerender) {
      return null;
    }

    const { method } = request;
    if (method !== 'GET' && method !== 'HEAD') {
      return null;
    }

    const assetPath = this.buildServerAssetPathFromRequest(request);
    const {
      manifest: { locale },
      assets,
    } = this;

    if (!assets.hasServerAsset(assetPath)) {
      return null;
    }

    const { text, hash, size } = assets.getServerAsset(assetPath);
    const etag = `"${hash}"`;

    return request.headers.get('if-none-match') === etag
      ? new Response(undefined, { status: 304, statusText: 'Not Modified' })
      : new Response(await text(), {
          headers: {
            'Content-Length': size.toString(),
            'ETag': etag,
            'Content-Type': 'text/html;charset=UTF-8',
            ...(locale !== undefined ? { 'Content-Language': locale } : {}),
            ...headers,
          },
        });
  }

  /**
   * Handles the server-side rendering process for the given HTTP request.