Intercept clicks on external links and pass them to a redirector.

redirectLinks.js

document.body.addEventListener('click', function(event) {
  var target = event.target.closest('a[href]');
  if (!target) return;
  var href = encodeURIComponent(target.getAttribute('href'));
  if (!href.startsWith('http')) return
  if (href.includes('archive.org')) return
  var url = `/redirect.php?url=${href}`;
  if (target.closest('.h-entry') && target.closest('.h-entry').querySelector('time.dt-published[datetime]')) {
    var date = encodeURIComponent(target.closest('.h-entry').querySelector('time.dt-published').getAttribute('datetime'));
    url += `&date=${date}`;
  }
  target.href = url;
}, true);

In this case, the links are being passed to a PHP file called redirect.php:

https://gist.github.com/adactio/3d6983bea9b30c993a65b12537ce930c