Ruby Code

simple-server.rb

require 'socket'

module MyServer
  @@routes = {
    "/" => "Hello World!\n"
  }

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

  def start_server
    server = TCPServer.new('localhost', 8080)

    loop do
      socket = server.accept
      request = socket.gets
      method, path, version = request.lines[0].split

      unless @@routes.has_key?(path)
        response(socket, "Route not found\n")
        next
      end

      content =  @@routes[path]
      response(socket, content)
    end
  end

  def get(path, &block)
    @@routes[path] = block.call + "\n"
  end
end

include MyServer # include module's methods into current scope

get '/home' do
  "Hey, welcome to jungle"
end

get '/about' do
  "We are fsociety"
end

start_server

# tests this simple server with curl
# curl localhost:8080/about => 'We are fscociety'