[英]HTTP POST request error “Error: Can't set headers after they are sent.”
[英]"Can't set headers after they are sent" and empty post request body
我一直在关注登录/注册身份验证应用程序的教程。 每当我发送 POST 请求时,我都会收到错误“发送后无法设置标头”。 我试图 console.log 请求正文,它是空的。 我不知道我哪里做错了。 请帮忙。
用户.js
var express = require('express');
var router = express.Router();
var User = require('../models/User')
/* GET users listing. */
router.get('/', function(req, res, next) {
res.send('respond with a resource');
});
router.get('/register', function(req, res, next) {
res.render('register', {title:'Register'});
});
router.get('/login', function(req, res, next) {
res.render('login', {title: 'Login'})
});
router.post('/register', function(req, res, next) {
var name = req.body.name;
var email = req.body.email;
var username = req.body.username;
var password = req.body.password;
var password2 = req.body.password2;
if (req.files && req.files.profileimage) {
console.log('Uploading file...');
var profileimageOriginalName = req.files.profileimage.originalname;
var profileimageName = req.files.profileimage.name;
var profileimageMime = req.files.profileimage.mimetype;
var profileimageExt = req.files.profileimage.extension;
var profileimageSize = req.files.profileimage.size;
var profileimagePath = req.files.profileimage.path;
} else {
var profileimageName = 'noimage.png'
}
req.checkBody('name', 'Name field is required').notEmpty();
req.checkBody('email', 'Email field is required').notEmpty();
req.checkBody('email', 'Email field is not valid').isEmail();
req.checkBody('username', 'Username field is required').notEmpty();
req.checkBody('password', 'Password field is required').notEmpty();
req.checkBody('password2', 'Password does not match').equals(req.body.password);
var errors = req.validationErrors()
if (errors) {
res.render('register', {
errors: errors,
name: name,
email: email,
username: username,
password: password,
password2: password2
});
} else {
var newUser = new User({
name: name,
email: email,
username: username,
password: password,
profileimage: profileimageName
})
}
User.createUser(newUser, function(err, user) {
if (err) throw err;
console.log(user);
})
req.flash('sucess', 'You are now registered and may login');
res.location('/');
res.redirect('/');
})
module.exports = router;
应用程序.js
var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var session = require('express-session');
var passport = require('passport');
var LocalStrategry = require('passport-local').strategy;
var bodyParser = require('body-parser');
var expressValidator = require('express-validator');
var flash = require('connect-flash');
var multer = require('multer')
var mongo = require('mongodb');
var mongoose = require('mongoose');
var db = mongoose.connection
var routes = require('./routes/index');
var users = require('./routes/users');
var app = express();
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');
// handle file upload
var upload = multer({dest: './uploads'});
// uncomment after placing your favicon in /public
//app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
app.use(session({
secret: 'secret',
saveUninitialized: true,
resave: true
}))
app.use(passport.initialize());
app.use(passport.session());
app.use(expressValidator({
errorFormatter: function(param, msg, value) {
var namespace = param.split('.')
, root = namespace.shift()
, formParam = root;
while(namespace.length) {
formParam += '[' + namespace.shift() + ']';
}
return {
param : formParam,
msg : msg,
value : value
};
}
}));
app.use(flash())
app.use(function (req, res, next) {
res.locals.messages = require('express-messages')(req, res);
next();
});
app.use('/', routes);
app.use('/users', users);
// catch 404 and forward to error handler
app.use(function(req, res, next) {
var err = new Error('Not Found');
err.status = 404;
next(err);
});
// error handlers
// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
app.use(function(err, req, res, next) {
res.status(err.status || 500);
res.render('error', {
message: err.message,
error: err
});
});
}
// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
res.status(err.status || 500);
res.render('error', {
message: err.message,
error: {}
});
});
module.exports = app;
更新:如果我删除验证器代码,错误将消失,但发布请求正文仍然为空
更新 2 :错误日志
POST /users/register 500 26.552 ms - 2629
Error: Can't set headers after they are sent.
at ServerResponse.OutgoingMessage.setHeader (_http_outgoing.js:346:11)
at ServerResponse.header (F:\Projects\nodeauth\node_modules\express\lib\response.js:718:10)
at ServerResponse.send (F:\Projects\nodeauth\node_modules\express\lib\response.js:163:12)
at done (F:\Projects\nodeauth\node_modules\express\lib\response.js:957:10)
at Object.exports.renderFile (F:\Projects\nodeauth\node_modules\jade\lib\index.js:374:12)
at View.exports.__express [as engine] (F:\Projects\nodeauth\node_modules\jade\lib\index.js:417:11)
at View.render (F:\Projects\nodeauth\node_modules\express\lib\view.js:126:8)
at tryRender (F:\Projects\nodeauth\node_modules\express\lib\application.js:639:10)
at EventEmitter.render (F:\Projects\nodeauth\node_modules\express\lib\application.js:591:3)
at ServerResponse.render (F:\Projects\nodeauth\node_modules\express\lib\response.js:961:7)
at F:\Projects\nodeauth\app.js:99:7
at Layer.handle_error (F:\Projects\nodeauth\node_modules\express\lib\router\layer.js:71:5)
at trim_prefix (F:\Projects\nodeauth\node_modules\express\lib\router\index.js:310:13)
at F:\Projects\nodeauth\node_modules\express\lib\router\index.js:280:7
at Function.process_params (F:\Projects\nodeauth\node_modules\express\lib\router\index.js:330:12)
at next (F:\Projects\nodeauth\node_modules\express\lib\router\index.js:271:10)
at Layer.handle_error (F:\Projects\nodeauth\node_modules\express\lib\router\layer.js:67:12)
at trim_prefix (F:\Projects\nodeauth\node_modules\express\lib\router\index.js:310:13)
at F:\Projects\nodeauth\node_modules\express\lib\router\index.js:280:7
at Function.process_params (F:\Projects\nodeauth\node_modules\express\lib\router\index.js:330:12)
at Immediate.next (F:\Projects\nodeauth\node_modules\express\lib\router\index.js:271:10)
at Immediate.<anonymous> (F:\Projects\nodeauth\node_modules\express\lib\router\index.js:618:15)
发送给客户端后,您无法设置标头。
res.render
在出现错误时发送响应。 之后,您再次尝试通过res.location
和res.redirect
发送标头。
将res.redirect
移动到 else 块。
var multer = require('multer');
var upload = multer();
router.post('/register', upload.array(), function(req, res, next) {
var name = req.body.name;
var email = req.body.email;
..................
if (errors) {
res.render('register', {
errors: errors,
name: name,
email: email,
username: username,
password: password,
password2: password2
});
} else {
var newUser = new User({
name: name,
email: email,
username: username,
password: password,
profileimage: profileimageName
})
//now this is also in the else block
User.createUser(newUser, function(err, user) {
if (err) throw err;
console.log(user);
})
req.flash('sucess', 'You are now registered and may login');
res.location('/');
res.redirect('/');
//till here so you don't send response twice
}
})
你面临这个是因为:
req.flash('sucess', 'You are now registered and may login'); //this is okay
res.location('/'); //[1]
res.redirect('/'); //[2]
[1]您正在设置标头并重定向到 '/' route 。
[2]您正在设置传递状态代码的标头:302 并重定向到“/”路由。
等一下? 你不是已经在步骤 1 中设置了标题吗? 是的,这就是错误的意思。 每个请求只能有一个响应。 使用此获取更多信息。
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