We updated our HTTP-checks and added new API-Funktions. You can craft your own HTTP-requests now, e.g. do a GET with HTTP 1.0 with or without Host-Header and check the response, either only the HTTP-Servers header-info or the complete file, you can even filter for some special lines e.g. to get only the Server-Header or so.
This check does support servers listening on multiple IPs and is also capable of doing https.
We started implementing this backend to Serversniffs frontend - you might expect more HTTP-Checks based on this backendscript to come.