问req.session.destroy不起作用

EN

app.use(session({
    secret: 'jordan-peterson-is-a-fraud',
    resave: false,
    saveUninitialized: false,
    unset: 'destroy',
    cookie: {
        httpOnly: false
    },
    store: new MongoStore({ mongooseConnection: mongoose.connection })
}));

fetch('http://localhost:3000/logout', {
    method: 'post',
    headers: {
        'Accept': 'application/json',
        'Content-Type': 'application/json'
    },
    mode: 'cors',
    credentials: 'include'
})

{
    ...
    sessionID: '<encrypted-session-ID>',
    session: Session {
      cookie: {
        path: '/',
        _expires: null,
        originalMaxAge: null,
        httpOnly: false
      }
    }
    ...
}

router.all('/logout', async function(req, res){
    if (req.session) {
        req.session.destroy();
        return res.end();
    }
}