NodeJS - 服务器响应 404 然后加载页面

Question

有人了解我的 nodeJS 应用程序中发生了什么吗？当我使用 ajax 进行异步调用时，服务器首先响应 404 错误，然后加载页面。该应用程序工作正常，但我有很多无聊的日志说 "Can't set headers after they are sent."

这是路线部分

module.exports = function(passport) {
          var router = express.Router();
          ........
          router.get('/dashboard', isLogged, dashcontroller.showdashboard);
          router.get('/dashboard/general', isLogged, dashcontroller.general);
          ........
          return router;
    }

这里是控制器

exports.showdashboard = function(req, res, next) {
  if (req.user.status == 'active')
    res.render('dashboard', { title: 'title' , user: req.user});
  else
    res.redirect('/user/logout');

  next();
}


exports.general = function(req, res, next) {
  if (req.user.status == 'active')
    res.render('general', { title: 'title' , user: req.user});
  else
    res.redirect('/user/logout');

  next();
}

异步请求，此代码可由客户端从 /dashboard 访问并驻留在 public/javascripts/code.js 中。客户端找到并执行没有问题。

$(function() {
    $("li.infos").click(function() {
      $("li.basket").removeClass("active")
      $("li.infos").addClass("active")
        $('.main-container')
           .load('/user/dashboard/general');
    });
});

一切正常，但我仍然收到那些无聊的日志

GET /stylesheets/dashboard.css 304 0.555 ms - -
GET /javascripts/dashboard.js 304 0.280 ms - -
GET /javascripts/basket.js 304 0.323 ms - -
abc deserializeUser
Executing (default): SELECT `id`, `username`, `public_key`, `email`, `password`, `last_login`, `basketcount`, `status`, `activation_token`, `createdAt`, `updatedAt` FROM `users` AS `user` WHERE `user`.`id` = 6;

GET /user/dashboard/general 404 35.837 ms - 2290
Error: Can't set headers after they are sent.
    at ServerResponse.OutgoingMessage.setHeader (_http_outgoing.js:356:11)
    at ServerResponse.header (/home/me/Documents/app/node_modules/express/lib/response.js:730:10)
and the trace goes on

有人知道发生了什么事吗？谢谢你的建议

Answer 1

Can't set headers after they are sent." 不是无聊的日志消息。

您在编写 http 响应后调用 next()，这就是您遇到此问题的原因。例如

exports.showdashboard = function(req, res, next) {
   if (req.user.status == 'active')
     return res.render('dashboard', { title: 'title' , user: req.user});
   else
     return res.redirect('/user/logout');
}

并且，与exports.general相同。

NodeJS - 服务器响应 404 然后加载页面

NodeJS - Server responds with 404 and then loads the page

javascript

ajax

node.js

http-status-code-404