nginx [engine x] is a HTTP server and mail proxy server written by Igor Sysoev.
Windows-1251 (a.k.a. code page CP1251) is a popular 8-bit character encoding, designed to cover languages that use the Cyrillic script such as Russian, Bulgarian, Serbian Cyrillic and other languages.
This page contains a meta robots tag which tells search engines and robots to index or not index the page.