title: How to fix R CMD check NOTE on incoming feasibility due to 'Too Many Requests' for URLs
body: <p>Checking my R package on winbuilder (devel and release 4.0.3) yields a NOTE for incoming feasibility with many blocks like this:</p>
  <pre><code>Found the following (possibly) invalid URLs:
    URL: https://github.com/ropensci/drake
      From: inst/doc/third-party-integrations.html
            NEWS.md
      Status: 429
      Message: Too Many Requests
  </code></pre>
  <p>I used the package <a href="https://github.com/r-lib/urlchecker" rel="nofollow noreferrer">{urlchecker}</a> to make sure all URLs are correct (i.e. valid and no re-directs). Can I safely ignore this warning on submission? I assume I could probably reduce the number of URLs in my package to get rid of it but I'd want to avoid this if possible.</p>