身份validationExpressJS – > passportJs：错误：发送后无法设置标头

我正在使用passportjs在expressjs中进行身份validation。 这是我的代码login.js

passport.use(new LocalStrategy( function(username, password, done) { //console.log(username); Usercollection.findOne({ username: username }, function (err, user) { if (err) { return done(err); } if (!user) { return done(null, false, { message: 'Incorrect username.' }); } else{ return done(null, user); } // if (!user.validPassword(password)) { // return done(null, false, { message: 'Incorrect password.' }); // } }); } )); passport.serializeUser(function(user, done) { done(null, user); }); passport.deserializeUser(function(user, done) { done(null, user); }); router.post('/', passport.authenticate('local', { successRedirect: '/automation-panel', failureRedirect: '/' }) ); 

和users.js是

 var express = require('express'); var router = express.Router(); /* GET users listing. */ router.get('/', function(req, res, next) { if (req.isAuthenticated()){ next(); }else {res.redirect('/');} // var sess = req.session; // if(sess.username != null){ // // res.send("hello "+ sess.username); // console.log(req.user.username); // } // else{ // req.redirect('/'); // } // res.sendFile("fileUpload.html"); // res.send("hello success"); res.render('users/index', { title: 'Express'}); }); module.exports = router; 

并详细的错误是

 Error: Can't set headers after they are sent. at ServerResponse.OutgoingMessage.setHeader (http.js:690:11 

Answer 1

 router.get('/', function(req, res, next) { if (req.isAuthenticated()) { return res.render('users/index', { title: 'Express'}); } else return res.redirect('/'); }); 

如果问题仍然存在，那么您有另一个redirect。 所以也许这条线是问题。

 router.post('/', passport.authenticate('local', { successRedirect: '/automation-panel', failureRedirect: '/' }) ); 

Answer 2

 router.get('/', function(req, res, next) { if (req.isAuthenticated()){ res.render('users/index', { title: 'Express'}); }else { // Remove Below line. otherwise it will create infinite redirect loop. res.redirect('/'); } });