http-stats:
HTTP/1.1 Supported header field

The Supported field is NOT a standard HTTP header field and may not be supported by all clients.

Common Supported header values:

The non-standard "Supported" header is only sent by:

NOTE: this header may be sent directly by the server software or from some third party application running on that server.

Sample Supported web server response:

HTTP/1.1 200 OK
Content-Type: text/html; charset=UTF-8
Content-Length: 1910
Supported: com.microsoft.wm.srvppair, com.microsoft.wm.sswitch, com.microsoft.wm.predstrm, com.microsoft.wm.fastcache, com.microsoft.wm.startupprofile
Date: Fri, 30 Jul 2010 16:55:00 +0000

<!DOCTYPE html PUBLIC "-//W3C//DTD ...
...
...

Other common HTTP headers

Other less common headers