我在Cloud9 ide上一起使用Express和socket.io时遇到以下错误：
http.js:707
throw new Error('Can\'t set headers after they are sent.'); ^ Error: Can't set headers after they are sent.
at ServerResponse.OutgoingMessage.setHeader (http.js:707:11)
at ServerResponse.res.setHeader (/var/lib/stickshift/523075494382ec51c3000001/app-root/data/610464/node_modules/express/node_modules/connect/lib/patch.js:59:22)
at next (/var/lib/stickshift/523075494382ec51c3000001/app-root/data/610464/node_modules/express/node_modules/connect/lib/proto.js:153:13)
at Function.app.handle (/var/lib/stickshift/523075494382ec51c3000001/app-root/data/610464/node_modules/express/node_modules/connect/lib/proto.js:198:3)
at Server.app (/var/lib/stickshift/523075494382ec51c3000001/app-root/data/610464/node_modules/express/node_modules/connect/lib/connect.js:65:37)
at Manager.handleRequest (/var/lib/stickshift/523075494382ec51c3000001/app-root/data/610464/node_modules/socket.io/lib/manager.js:564:28)
at Server. (/var/lib/stickshift/523075494382ec51c3000001/app-root/data/610464/node_modules/socket.io/lib/manager.js:118:10)
at Server.EventEmitter.emit (events.js:117:20)
at HTTPParser.parser.onIncoming (http.js:2056:12)
at HTTPParser.parserOnHeadersComplete [as onHeadersComplete] (http.js:120:23)
下面是我的server.js代码：
var express = require('express');
var app = express()
, http = require('http')
, server = http.createServer(app)
, io = require('socket.io').listen(server);
server.listen(process.env.PORT, process.env.IP);
app.get('/', function(req,res) {
res.writeHead(200, {'Content-Type': 'text/plain'});
res.write('Hello World\n');
})
我正在使用节点：“0.10.x”，socket.io：“0.9.14”并表示：“3.x” . 此错误仅在Cloud9 ide上出现 . 在localhost上运行正常 . 请帮忙 .
1 回答
我遇到了同样的问题 . 虽然这不是一个好的解决方案，但将Express恢复到3.1.0版本可以解决这个问题 . 最高版本的Express和Socket.io不能很好地协同工作 .
我还原后使用的版本是：
节点： 0.10.x ，
Socket.io: 0.9.16 ,
快递： 3.1.0