IT技术 - 带有 Express Backend 和 express-session 的 React App - 吾爱随笔录

我目前有一个 React 应用程序（通过create-react-app）和一个用于我的 API 调用的 Express 服务器。它们都单独运行并且一直工作正常，直到我遇到这个问题：

我也在使用express-session和passport进行用户身份验证。我能够对用户进行身份验证，但会话不会在 API 调用之间持续存在。如果我成功登录，下次我进行 API 调用时，req.sessionID会有所不同，并且req.isAuthenticated()会返回false.

这是我的服务器代码：

'use strict'

var express         = require('express');
var path                = require('path');
var bodyParser      = require('body-parser');
var cookieParser    = require('cookie-parser');
var mongoose      = require('mongoose');
var passport      = require('passport');
var session       = require('express-session');
var cors          = require('cors');
var flash         = require('connect-flash');

var store         = require('./store');
var database      = require('./database');

var app     = express();
var port    = process.env.port || 3001;
var router  = express.Router();

var promise = mongoose.connect('mongodb://localhost:27017/lifeless-db', {useMongoClient: true});

//app.use(cors());
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());
app.use(cookieParser('lifeless-secret-01890'));
app.use(session({
  secret: 'lifeless-secret-01890',
  saveUninitialized: true,
  cookie: {
    secure: false,
  }
}));
app.use(flash());

app.use(passport.initialize());
app.use(passport.session());
// Initialize Passport
var authinit = require('./auth/init');
authinit(passport);

// For debugging:
app.use(function(req, res, next) {
  console.log("SessionID: " + req.sessionID);
  console.log(req.isAuthenticated() ? "This user is logged in" : "This user is NOT logged in");
  next();
});



// GET

app.get('/items', function(req, res) {
  store.getAllItems((items) => {
    if(!items) return res.send({error: true, message: 'Error loading store :/', items: null});
    else return res.send({error: false, message: 'Success', items: items});
  });
});

app.get('/login', function(req, res) {
  console.log(req.flash());
  console.log("Login fail");
  res.send({error: true, message: 'Unknown error'});
});


// POST

app.post('/message', function(req, res) {
  database.submitMessage(req.body.email, req.body.message, (success) => {
    if (success) return res.send({error: false, message: 'Success'});
    else return res.send({error: true, message: 'Error sending message'});
  });
});


app.post('/login', passport.authenticate('local', {failureRedirect: '/login', failureFlash: true}), function(req, res) {
  console.log(req.flash());
  console.log("Login success");
  return res.send({error: false, message: 'Success'});
});



// SERVER

app.listen(port, function(){
  console.log('Server started.');
  console.log('Listening on port ' + port);
});

这是来自 React 应用程序的 API 调用示例（使用axios）：

login(e) {
    e.preventDefault();

    axios({
      method: 'post',
      url: 'http://localhost:3001/login',
      data: {
        username: this.state.username,
        password: this.state.password,
      }
    })
    .then((response) => {
      console.log(response.data);
      if (response.data.error) {
        this.setState({error: true, errmessage: response.data.message});
      } else {
        this.setState({redirect: true});
      }
    })
    .catch((error) => {
      this.setState({error: true, errmessage: 'Error logging in'});
    });
  }

我认为必须有某种方式让 React 以某种方式存储会话（？），但我对 React 相当陌生，并且真的不知道如何将它与快速后端一起使用。