Appends the "Code on Val Town" ribbon to an HTTP Response.

• new modifyResponse(res, { handle: "andre", name: "foo" }) - define which val to link to;
• new modifyResponse(res) - infer the val from the call stack.

Example: @andreterron/openable_res

import { modifyResponse } from "https://esm.town/v/andreterron/codeOnVT_modifyResponse";
import { html } from "https://esm.town/v/stevekrouse/html?v=5";

export default async (req: Request): Promise<Response> => {
  return modifyResponse(html(`
    <h2>Hello world!</h2>
    <style>* { font-family: sans-serif }</style>
  `));
};

Migrated from folder: A_Features/_24_02_15_Open_In_ValTown/codeOnVT_modifyResponse