“发送后不能设置标题”和空邮件请求主体
我一直在关注login/注册身份validation应用程序的教程。 每当我发送POST请求时，我总是收到错误“发送后无法设置标题”。 我试图console.log请求正文，它是空的。 我不知道我做错了什么。 请帮忙。
users.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; app.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validation代码，错误将会消失，但发布请求主体仍然是空的
UPDATW 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，您不能设置标题。
res.render错误时， res.render发送响应。 之后再次尝试通过res.location和res.redirect发送标题。
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 } })
你面对这个是因为：
req.flash('sucess', 'You are now registered and may login'); //this is okay res.location('/'); //[1] res.redirect('/'); //[2]
[1]你正在设置标题并redirect到“/”路线 。
[2]你正在设置标题传递状态代码：302和redirect到“/”路线。
等一下？ 你没有在步骤1中设置标题？ 是的，这是错误的意思。 每个请求只能有一个响应。 使用这个更多的信息。