export function getCallbackURL(request: Request) {
  const requestURL = new URL(request.url);
  const pathname = requestURL.pathname.replace("/authorization/", "/callback/");
  const host = request.headers.get("x-forwarded-host") ?? requestURL.host;

  const callback_url = new URL(`${requestURL.protocol}//${host}${pathname}`);

  return callback_url;
}