Malformed HTTP requests with repeated protocol (GET /https://https://www.DOMAIN.com) in Apache logs – what vulnerability are they scanning for?

About once per day, I’m seeing the following series of requests in my Apache 2.4 httpd logs, and I’m trying to figure out what vulnerability is being scanned for. Each occurrence of these scans has an identical pattern (repla… Continue reading Malformed HTTP requests with repeated protocol (GET /https://https://www.DOMAIN.com) in Apache logs – what vulnerability are they scanning for?