错误:无法设置头发送之后。当自动重新连接到MongoDB的
我收到以下错误:
Error: Can't set headers after they are sent.
at ServerResponse.OutgoingMessage.setHeader (http.js:708:11)
at ServerResponse.res.setHeader (/home/rahul/workspace1/iranproud/node_modules/express/node_modules/connect/lib/patch.js:63:22)
at next (/home/rahul/workspace1/iranproud/node_modules/express/node_modules/connect/lib/proto.js:156:13)
at next (/home/rahul/workspace1/iranproud/node_modules/express/node_modules/connect/lib/middleware/session.js:318:9)
at /home/rahul/workspace1/iranproud/node_modules/express/node_modules/connect/lib/middleware/session.js:342:9
at /home/rahul/workspace1/iranproud/node_modules/connect-mongo/lib/connect-mongo.js:220:17
at /home/rahul/workspace1/iranproud/node_modules/connect-mongo/node_modules/mongodb/lib/mongodb/collection.js:953:5
at Cursor.nextObject (/home/rahul/workspace1/iranproud/node_modules/connect-mongo/node_modules/mongodb/lib/mongodb/cursor.js:678:5)
at commandHandler (/home/rahul/workspace1/iranproud/node_modules/connect-mongo/node_modules/mongodb/lib/mongodb/cursor.js:658:14)
at Server.Base._callHandler (/home/rahul/workspace1/iranproud/node_modules/connect-mongo/node_modules/mongodb/lib/mongodb/connection/base.js:382:41)
我的配置如下:
我使用的连接 - 蒙戈的会话存储,并自动重新连接是真实的,即。
app.use(express.session({
store: new MongoStore({
url: 'mongodb://192.168.1.104:27017/db_ip',
auto_reconnect:true
}, function(e) {
//code
}),
cookie: {
expires: new Date(Date.now() + 7200000)
},
secret: '*********'
}));
我通过手动停止mongod的服务测试此代码和URL请求,它是在(连续浏览器中运行,直到它被连接到数据库)等待状态,所以我一直对请求超时下面的代码(后4其次,它会在维护页面重定向到)。
app.use(function(req, res, next){
res.setTimeout(4000, function(){
console.log('Request has timed out.');
var fullURL = req.protocol + "://" + req.get('host') + req.url;
var client_ip = req.connection.remoteAddress;
console.log("\nRequested Url is : " + fullURL + " :: From IP Address : " + client_ip + " : on date : " + new Date());
res.render('undermaintenance');
});
next();
});
但是当我重新启动的mongod它会自动连接到数据库和网站工作,但在控制台中我得到这个错误:
Error: Can't set headers after they are sent.
回答如下:
我在想什么是,1 - 下一个被调用,响应被发送到客户端,但2-- 4秒钟后,你要发送res.render()..这也得到呼吁。没有看到完整的代码我不知道如何帮助你。
app.use(function(req, res, next){
res.setTimeout(4000, function(){
console.log('Request has timed out.');
var fullURL = req.protocol + "://" + req.get('host') + req.url;
var client_ip = req.connection.remoteAddress;
console.log("\nRequested Url is : " + fullURL + " :: From IP Address : " + client_ip + " : on date : " + new Date());
res.render('undermaintenance'); // ---2
});
next(); ---> 1
});