Using WEBrick's GenericServer to talk over TCP without worrying about socket mechanics

webrick genericserver demo.rb

# to test, run this file and `nc localhost 34242`, type a line and press enter

require 'webrick'
s = WEBrick::GenericServer.new(:Port => 34242)
trap("INT") { s.shutdown }
s.start do |sock|
  begin
    incoming=sock.readline
  rescue EOFError => err
    break
  end
  sock.print(incoming.upcase)
end