Possible!?!? - Merging Response Headers and Response Body

    if (STUFF) 
    {
      response.headers.set(
        "Set-Cookie",
        "pricing-mode=on;max-age=604800;Path=/"
      )
      if (!contentType.startsWith("text/html")) {
        return response;
      }
      html.on("body", new PRICING_MODE_ON());
    }