求助：emitter.setMaxListeners()

 (node) warning: possible EventEmitter memory leak detected. 11 listeners added. Use emitter.setMaxListeners() to increase limit.
Trace
    at Socket.EventEmitter.addListener (events.js:168:15)
    at Socket.EventEmitter.once (events.js:189:8)
    at Socket.setTimeout (net.js:173:12)
    at ClientRequest.setTimeout (http.js:1557:17)
    at ClientRequest.setTimeout (http.js:1569:10)
    at ClientRequest.g (events.js:185:14)
    at ClientRequest.EventEmitter.emit (events.js:115:20)
    at ClientRequest.onSocket (http.js:1514:9)
    at process.startup.processNextTick.process._tickCallback (node.js:244:9)

使用request模块发送请求，当请求多的时候就出现这个警告，谁能告诉我一下应该在哪儿设置setMaxListeners()，我在自己的环境中没有调试出来。

shiedman 1楼•12 年前

治标：

var req=http.request(options,function(res){
    //......
});
/** 此处为req.once，而非req.on，二者区别见官方文档api说明**/
req.once('socket',function(socket){
    /** 默认listener数是10，提高到20应该足够**/
    socket.setMaxListeners(20);
});

要治本，将timeout的回调函数独立出来，在response事件之后手动注销timeout的监听

var req=http.request(options,function(res){
    req.removeAllListeners();//clear out all listeners
    req.setTimeout(0,timeout_callback);//clear out timeout listener
    //do more work.......
});
function timeout_callback(){
    //abort request?......
}
/** for example, timeout in 30s**/
req.setTimeout(30000,timeout_callback);

PS: 记得node某个版本后clientrequest会自动注销监听，楼主的版本很旧？

liuj0225 2楼•12 年前作者

非常感谢