[sheetjs]

In general, how do you determine what software is running on the server side? None of the obvious links are to .php documents and the headers only indicate nginx

[cturhan]

Look their cookies. You will see PHPSESSID meaning that session is provided by PHP.

Although, you can do the same with node session module it seems like php anyway.

Plus: http://builtwith.com/evennode.com

[iancarroll]

There's a cookie called PHPSESSID.

[_Soulou]

A PHPSESSID appears in the cookie.