auth-header.md

const authLink = setContext((_, oldContext) => {
  return produce(oldContext, draft => {
    if (!draft.headers) {
      draft.headers = {};
    }
    draft.headers["X-SOURCE"] = "browser";
    const token = cookie.get("token");
    if (token) {
      draft.headers["Authorization"] = `bearer ${token}`;
    }
  });
});