http-stats:
HTTP/1.1 Accept-Language header field

Common Accept-Language header values:

Accept-Language: en-us, en
Accept-Language: us-en

Sample Accept-Language web server response:

HTTP/1.1 200 OK
Content-Type: text/html; charset=UTF-8
Content-Length: 2054
Accept-Language: en-us, en
Date: Fri, 30 Jul 2010 16:54:36 +0000

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

Other common HTTP headers

Other less common headers