发送节点js后无法设置标头
问题描述：
我正在尝试发送一些表单数据，但是我使用express.js收到此错误：
I'm trying to send some form data, but I get this error using express.js:
无法设置标题发送后。
Can't set headers after they are sent.
这是我到目前为止的代码：
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!!' });
}
});
答
通过控制台记录res.send（用户）你是再次发送。您只能发送一次和一次。
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!!' });
}
});