require "socket"

server = TCPServer.new(3000)
puts "Ruby app listening on 3000"

loop do
  client = server.accept
  client.gets # read the incoming HTTP request line (and discard it)
  body = "Hello from Ruby!"
  client.print "HTTP/1.1 200 OK\r\nContent-Type: text/plain\r\nContent-Length: #{body.bytesize}\r\nConnection: close\r\n\r\n#{body}"
  client.close
end