nginx [engine x] is a HTTP server and mail proxy server written by Igor Sysoev.
The DOCTYPE is a required preamble for HTML5 websites.
These websites are related to utw.pl in terms of content, traffic and structure
sutw.szczecin.pl
sbc.org.pl
mkidn.gov.pl
mswia.gov.pl
nowyebib.info
bn.org.pl
bip.gov.pl
seniorzy.pl