http://rubylearning.com/satishtalim/ruby_socket_programming.html
https://www.tutorialspoint.com/ruby/ruby_socket_programming.htm
https://www.sitepoint.com/ruby-tcp-chat/
https://en.wikibooks.org/wiki/Ruby_Programming/Reference/Objects/Socket
http://practicingruby.com/articles/implementing-an-http-file-server
http://ruby-doc.com/docs/ProgrammingRuby/html/lib_network.html
https://spin.atomicobject.com/2013/09/30/socket-connection-timeout-ruby/
http://blog.appsignal.com/2016/11/23/ruby-magic-building-a-30-line-http-server-in-ruby.html
http://apps.jcns.fz-juelich.de/doku/sc/tcp_server_ruby
http://grpm.ca/article/Notes%20on%20Working%20With%20TCP%20Sockets Notes on working with Sockets
http://blog.honeybadger.io/building-a-simple-websockets-server-from-scratch-in-ruby/