Method push

src/flask/ctx.py:377–404

(self)

        return self._session

    def push(self) -> None:
        # Before we push the request context we have to ensure that there
        # is an application context.
        app_ctx = _cv_app.get(None)

        if app_ctx is None or app_ctx.app is not self.app:
            app_ctx = self.app.app_context()
            app_ctx.push()
        else:
            app_ctx = None

        self._cv_tokens.append((_cv_request.set(self), app_ctx))

        # Open the session at the moment that the request context is available.
        # This allows a custom open_session method to use the request context.
        # Only open a new session if this is the first time the request was
        # pushed, otherwise stream_with_context loses the session.
        if self._session is None:
            session_interface = self.app.session_interface
            self._session = session_interface.open_session(self.app, self.request)

            if self._session is None:
                self._session = session_interface.make_null_session(self.app)

        # Match the request URL after loading the session, so that the
        # session is available in custom URL converters.
        if self.url_adapter is not None:
            self.match_request()

    def pop(self, exc: BaseException | None = _sentinel) -> None:  # type: ignore
        """Pops the request context and unbinds it by doing that.  This will