ftp://ftp.is.co.za/rfc/rfc1808.txt
gopher://spinaltap.micro.umn.edu/00/Weather/California/Los%20Angeles
http://www.math.uio.no/faq/compression-faq/part1.html
mailto:mduerst@ifi.unizh.ch
news:comp.infosystems.www.servers.unix
telnet://melvyl.ucop.edu/