How to exclude a URL from the mixed content fixer

Sometimes, you may need to exclude a certain URL from the Mixed Content fixer in Really Simple Security, which updates all URLs from http:// to https://, except for hyperlinks to other domains.

This can be easily accomplished with a filter, which you can add to your functions.php. It will execute after the Mixed content fixer has done it’s job, allowing you to replace certain URLs back to http, like this:

function rsssl_exclude_http_url($html) {
  $html = str_replace("https://www.domain.com", "http://www.domain.com", $html);
  return $html;
}
add_filter("rsssl_fixer_output","rsssl_exclude_http_url");