import http.server
import socketserver

PORT = 9999

class Proxy(http.server.SimpleHTTPRequestHandler):
  def do_GET(self):
    self.send_response(200)
    self.send_header('Content-type', 'text/html')
    self.end_headers()
    self.wfile.write(b'What is this?')

Handler = Proxy

with socketserver.TCPServer(("", PORT), Handler) as httpd:
  print("server at port", PORT)
  httpd.serve_forever()