Unless disabled both nginx and PHP give away their version in the HTTP Header. Here is what that looks like:
$ curl -I http://test.local
HTTP/1.1 200 OK
Date: Fri, 11 Apr 2014 08:20:36 GMT
Content-Type: text/html; charset=UTF-8
Vary: Accept-Encoding ...
2016-05-25 308℃ 0 COMMENT
WHAT IS WPAD
The Web Proxy Auto-Discovery Protocol (WPAD) is a method used by clients to locate the URL of a configuration file using DHCP and/or DNS discovery methods. Once detection and download of the configuration file is complete, it can be executed to determine the proxy for a specified URL.
HOW DOES I ...
2015-11-09 1257℃ 1 COMMENT