I've got the same html on two separate Mediatemple (DV) servers and one Godaddy server. Godaddy resolves quickly and both Mediatemple server fail with 502 when run though Facebook debugger.
Mediatemple (DV). http://www.site500.com/facebook.html
Godaddy http://www.trainlearncreate.com/facebook.html
Also my server access logs do not register a hit by Facebook when the 502 is returned.