intercept requests to example.com, enable automatic cookie sending

browser_request_interceptors.ts

type myfetch = (input: RequestInfo, init?: RequestInit) => Promise<Response>;

function isRequest(rq: any): rq is Request {
  return (rq as Request).url !== undefined;
}

(function (fetch: myfetch) {
  window.fetch = async function (this: myfetch, input: RequestInfo, init) {
    let url;
    if (isRequest(input)) {
      url = new URL(input.url);
    } else if (input.startsWith("http")) {
      url = new URL(input);
    }

    // debugger;

    const newinit: RequestInit = { ...init };
    if (url && url.hostname.match(/\.example\.com$/)) {
      newinit.credentials = "include";
    }

    return await fetch.apply(this, [input, newinit]);
  };
})(window.fetch);

type xhropen = (
  method: string,
  url: string,
  async?: boolean,
  username?: string | null,
  password?: string | null
) => void;

(function (open: xhropen) {
  XMLHttpRequest.prototype.open = function (
    this: XMLHttpRequest,
    method: string,
    url: string,
    async?: boolean,
    username?: string | null,
    password?: string | null
  ) {
    const res = open.apply(this, [method, url, async, username, password]);
    const u = new URL(url);
    if (u.hostname.match(/example\.com$/i)) {
      this.withCredentials = true;
      // this.setRequestHeader("X-fnord", "see them");
    }
    return res;
  };
})(XMLHttpRequest.prototype.open);