code: def do_GET(self):
          
          self.send_response(http_client.OK)
          self.send_header('Content-type', 'text/html')
          self.end_headers()
          parts = urllib.parse.urlparse(self.path)
          query = _helpers.parse_unique_urlencoded(parts.query)
          self.server.query_params = query
          self.wfile.write(
              b'<html><head><title>Authentication Status</title></head>')
          self.wfile.write(
              b'<body><p>The authentication flow has completed.</p>')
          self.wfile.write(b'</body></html>')
docs: Handle a GET request.
  
          Parses the query parameters and prints a message
          if the flow has completed. Note that we can't detect
          if an error occurred.