javascript - Passport JS "Can' t 在发送后设置标题"

Question

当我使用 Passport JS 成功登录时出现此错误。登录后尝试重定向到主页。

执行此操作的代码:

app.post('/login', 
  passport.authenticate('local', {failureRedirect: '/login' }),
  function(req, res) {
    res.redirect('/');
  });

完全错误:

Error: Can't set headers after they are sent.
    at ServerResponse.OutgoingMessage.setHeader (http.js:644:11)

我错过了什么吗？不知道为什么会发生此错误。我仍然可以使用该应用程序，我只是不想出现错误。

Answer 1

您正在重定向用户，因此 serializeUser 函数被调用了两次。而在

 passport.use(new FacebookStrategy({
 ...

一定要添加这个 else 否则它会被调用两次，从而发送两次 header 并导致错误。试试这个:

passport.use(new FacebookStrategy({
...
},
function(accessToken, refreshToken, profile, done) {
// asynchronous verification, for effect...
process.nextTick(function () {

  // To keep the example simple, the user's Facebook profile is returned to
  // represent the logged-in user.  In a typical application, you would want
  // to associate the Facebook account with a user record in your database,
  // and return that user instead.
    User.findByFacebookId({facebookId: profile.id}, function(err, user) {
        if (err) { return done(err); }
        if (!user) {
            //create user User.create...
            return done(null, createdUser);
        } else { //add this else
            return done(null, user);
        }
    });
  });
 }
));