Detect exposing Nginx version

[disconnect3d]

This is a feature request for detecting the missing of server_tokens off.

If it is not set, the Nginx will respond with a Server: nginx/<version> header containing nginx version. This might be helpful for an attacker who has an exploit for a particular Nginx version.

[dasJ]

… unless you use the more headers module in which case you could also have:

more_clear_headers Server X-Page-Speed X-Powered-By X-Redirect-By X-CF-Powered-By X-Hudson X-Jenkins;

which hides the Server header completely