问题
I'm trying to send some form data, but I get this error using express.js:
Can't set headers after they are sent.
This is my code so far:
app.post('/api/users/profile/:username', isAuthenticated, userUploads, function(req, res, next) {
if (req.params.username) {
User.findOne({ username: req.params.username }, function(err, user) {
if (err) return next(err);
user.profile.name = req.body.name;
user.profile.gender = req.body.gender;
var files = req.files.file;
if (files){
if (files.length > 0){
for (f in files){
user.profile.pictures.push(files[f])
}
}else{
user.profile.pictures.push(files)
}
}
user.save(function(err) {
if (err) return next(err);
res.send(200);
});
console.log(res.send(user)) //HERE IS WHERE I GET THE ERROR
});
}else{
return res.send(400, { message: 'User does not exist!!' });
}
});
回答1:
By console logging res.send(user) you are sending again. You can send once and once only.
app.post('/api/users/profile/:username', isAuthenticated, userUploads, function(req, res, next) {
if (req.params.username) {
User.findOne({ username: req.params.username }, function(err, user) {
if (err) return next(err);
user.profile.name = req.body.name;
user.profile.gender = req.body.gender;
var files = req.files.file;
if (files){
if (files.length > 0){
for (f in files){
user.profile.pictures.push(files[f])
}
}else{
user.profile.pictures.push(files)
}
}
user.save(function(err) {
if (err) return next(err);
res.status(200).send(user);
});
});
}else{
return res.send(400, { message: 'User does not exist!!' });
}
});
来源：https://stackoverflow.com/questions/28357634/cant-set-headers-after-they-are-sent-node-js