docs: def process_command_response(self, command, response):
          """
          Takes an HAProxy socket command and its response and either raises
          an appropriate exception or returns the formatted response.
          """
          if response.startswith(b"Unknown command."):
              raise UnknownCommandError(command)
          if response == b"Permission denied.\n":
              raise PermissionError(command)
          if response == b"No such backend.\n":
              raise UnknownServerError(command)
  
          response = response.decode()
          return response.rstrip("\n")