code: def handle_debug(self, environ, start_response, traceback_id):
          
          if traceback_id not in self.app.registry.tracebacks:
              abort(404)
          self._copy_over_traceback(traceback_id)
          traceback = self.tracebacks[traceback_id]
          rendered = traceback.render_full(evalex=self.evalex, secret=self.secret)
          response = Response(rendered.encode('utf-8', 'replace'),
                              headers=[('Content-Type', 'text/html; charset=utf-8'),
                                       ('X-XSS-Protection', '0')])
          return response(environ, start_response)
docs: Handles the debug endpoint for inspecting previous errors.
  
          :param environ: The environment which is passed into the wsgi application
          :type environ: dict[str, object]
          :param start_response: The start_response function of the wsgi application
          :type start_response: (str, list[(str, str)]) -> NoneType
          :param traceback_id: The id of the traceback to inspect
          :type traceback_id: int
  
          .. versionadded:: 0.1.0