我似乎无法找到解决我的问题的方法。我试图启动我的nodeJS/expressJS应用程序,但在“npm start”时收到错误。无法读取finalHandler节点模块中未定义的属性'_header'
的错误&堆栈跟踪:
/Users/jmccreary/Documents/NewHireSite/node_modules/finalhandler/index.js:94
if (!err && res._header) {
^
TypeError: Cannot read property '_header' of undefined
at /Users/jmccreary/Documents/NewHireSite/node_modules/finalhandler/index.js:94:20
at /Users/jmccreary/Documents/NewHireSite/node_modules/express/lib/router/index.js:635:15
at next (/Users/jmccreary/Documents/NewHireSite/node_modules/express/lib/router/index.js:210:14)
at Function.handle (/Users/jmccreary/Documents/NewHireSite/node_modules/express/lib/router/index.js:174:3)
at Function.handle (/Users/jmccreary/Documents/NewHireSite/node_modules/express/lib/application.js:174:10)
at app (/Users/jmccreary/Documents/NewHireSite/node_modules/express/lib/express.js:38:9)
at Object.<anonymous> (/Users/jmccreary/Documents/NewHireSite/app.js:101:25)
at Module._compile (module.js:571:32)
at Object.Module._extensions..js (module.js:580:10)
at Module.load (module.js:488:32)
at tryModuleLoad (module.js:447:12)
at Function.Module._load (module.js:439:3)
at Module.require (module.js:498:17)
at require (internal/module.js:20:19)
at Object.<anonymous> (/Users/jmccreary/Documents/NewHireSite/bin/www:7:11)
at Module._compile (module.js:571:32)
at Object.Module._extensions..js (module.js:580:10)
at Module.load (module.js:488:32)
at tryModuleLoad (module.js:447:12)
at Function.Module._load (module.js:439:3)
at Module.runMain (module.js:605:10)
at run (bootstrap_node.js:427:7)
有问题的代码(在node_modules/finalhandler/index.js):
(注:我添加了console.logs自己,他们不是一部分模块)
function finalhandler (req, res, options) {
var opts = options || {}
console.log("The req is: ", req);
console.log("The res is: ", res);
// get environment
var env = opts.env || process.env.NODE_ENV || 'development'
// get error callback
var onerror = opts.onerror
return function (err) {
var headers
var msg
var status
// ignore 404 on in-flight response
if (!err && res._header) {
debug('cannot 404 after headers sent')
return
}
...
从我的console.log()的如图所示的,输出为如下:
The req is: Authenticator {
_key: 'passport',
_strategies: { session: SessionStrategy { name: 'session' } },
_serializers: [],
_deserializers: [],
_infoTransformers: [],
_framework:
{ initialize: [Function: initialize],
authenticate: [Function: authenticate] },
_userProperty: 'user',
Authenticator: [Function: Authenticator],
Passport: [Function: Authenticator],
Strategy: { [Function: Strategy] Strategy: [Circular] },
strategies: { SessionStrategy: { [Function: SessionStrategy] super_: [Object] } } }
The res is: undefined
编辑:这是什么,我相信,是代码调用错误(从node_modules /快递/ lib中/ application.js中):
/**
* Dispatch a req, res pair into the application. Starts pipeline processing.
*
* If no callback is provided, then default error handlers will respond
* in the event of an error bubbling through the stack.
*
* @private
*/
app.handle = function handle(req, res, callback) {
var router = this._router;
// final handler
var done = callback || finalhandler(req, res, {
env: this.get('env'),
onerror: logerror.bind(this)
});
// no routes
if (!router) {
debug('no routes defined on app');
done();
return;
}
router.handle(req, res, done);
};
我的包。 JSON文件(使用快递4)如下:
{
"name": "newhiresite",
"version": "0.1.0",
"private": true,
"scripts": {
"start": "node ./bin/www"
},
"dependencies": {
"body-parser": "~1.17.1",
"connect-flash": "^0.1.1",
"cookie-parser": "~1.4.3",
"debug": "~2.6.3",
"express": "~4.15.2",
"express-session": "^1.15.3",
"express-validator": "^3.2.0",
"fs": "0.0.1-security",
"mongodb": "^2.2.25",
"mongoose": "^4.10.1",
"morgan": "~1.8.1",
"node-sass-middleware": "0.9.8",
"passport": "~0.3.2",
"passport-local": "~1.0.0",
"pug": "~2.0.0-rc.1",
"serve-favicon": "~2.4.2"
}
}
我能够运行教程的源代码就好了,并且它具有相同的模块,我的应用程序,这是几乎相同(除npm启动命令后的www/bin文件外)。我尝试删除其他模块,并在app.js文件中移动,无济于事。
任何指针或帮助将不胜感激。谢谢!
缺少最重要的部分:您使用'finalhandler'的代码。 – robertklep
我相信我加了正确的代码。这是我的第一个NodeJS应用程序,所以如果这是不正确的,请让我知道你相信可能会调用它。 –
你的代码中有一个地方叫'finalhandler(...)'。你应该发布该代码。 – robertklep