Redirect after verifying certificate date?

Question

htaccess

Is it possible to check the validity / date of the installed certificate in .htaccess in
order to use the result of the check in subsequent redirect rules?

For example, for a site with an expired SSL certificate to be available via http, with all media.

Answer 1

First, a TLS handshake occurs, and only then does HTTP begin. In other words, no, you can't. If you followed the https link, then either everything will go fine and the request will fly to the web server, or the browser will issue a warning.