http-stats:
HTTP/1.1 X-Server header field

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

Common X-Server header values:

The non-standard "X-Server" 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 X-Server web server response:

HTTP/1.1 200 OK
Content-Type: text/html; charset=UTF-8
Content-Length: 1140
X-Server: BCNPSO13
Date: Fri, 30 Jul 2010 17:04:55 +0000

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

Other common HTTP headers

Other less common headers