Is it possible to check the availability of a site before redirecting?

Question

Apache HTTP Server

Is it possible to configure Apache in such a way that the redirect from http to the https version of the site occurs only if the https version is working?
For example, in the VirtualHost section for all sites, a set of rewrite rules is written, which works only when the https version of the same site is working (configured by separate configs, not for all sites).

Answer 1

You can put haproxy between Apache and the site, and in the case when haproxy receives 500s from the "https" page, it automatically transfers the entire load to another available, so to speak, backend.

Answer 2

don't do that! especially if you have at least some kind of load.
almost certainly we are talking about several hosts and not the entire Internet, which means that you need a separate process to monitor availability and edit configs programmatically, apache2 reload works well.