Ability to check certs behind a CDN

Usage of CDNs is very popular. When a CDN is at play, the cert checked for a domain is that offered up by the CDN. Some customers want to connect directly to their hosts to check their certificates. This would be accomplished by allowing a per domain IP or alternative name to be set. Our outgoing connection should connect this IP/ name to retrieve the certificate, but use the actual domain name in certificate validation.