[Medium] exploring_net_protocol_3.rb

require 'webrick'
require 'set'
 
server = WEBrick::HTTPServer.new(Port: 3000)
set = Set.new
 
server.mount_proc '/' do |req, res|
  data, action = req.body.split(',')
  action ||= 'ADD'
 
  # Return set data for any command, no need to handle GET
  case action
  when 'ADD'
    set.add(data)
  when 'DEL'
    set.delete(data)
  end
 
  res.body = set.to_a.to_s
end
 
trap('INT') { server.shutdown }
 
server.start