thead_2_01.rb

require 'socket'

# run on localhost:3000
server = TCPServer.new('localhost', 3000)

loop do
  socket = server.accept
  request = socket.gets
  method, path = request.split
  sleep_time = rand(5)

  # some calculation is here
  sleep(sleep_time)

  response = "Hello World!\n" +
             "your request: #{request}" +
             "method: #{method.inspect}\n" +
             "path: #{path.inspect}\n" +
             "sleep time: #{sleep_time}\n"

  socket.print "HTTP/1.1 200 OK\r\n" +
               "Content-Type: text/plain\r\n" +
               "Connection: close\r\n" +
               "Content-Length: #{response.bytesize}\r\n"

  socket.print "\r\n"
  socket.print response

  socket.close
end