I want to fetch new data from this api every 20 seconds, I tried the following but this doesn't seem to work in prod. only in dev:

  const res = await fetch(
    "https://webmention.io/api/mentions.jf2?target=https://www.yusuf.fyi/posts/" +
      post?.slug +
      "&sort-by=published",
    { next: { revalidate: 20 } }
  );