layouts/partials/handle-version-switch-404.html

{{/*
If a 404 occurs and the referrer is a different version of the Dubbo documentation,
don't show the regular 404 error page, but instead redirect to the site root
*/}}
<script type="text/javascript">
  var sameBaseUrlRegExp = new RegExp("^" + location.protocol + "//" + location.host.replace(".", "\\.") + "/.*", "i");
  var DubboDocumentationUrlRegExp = new RegExp("^https?://(.+\\.)?dubbo.apache.org/.*", "i");
  if (!sameBaseUrlRegExp.test(document.referrer) && DubboDocumentationUrlRegExp.test(document.referrer)) {
    location.replace("/");
  }
</script>