关于keep-alive

每隔3000ms调用一次http请求，用http.Agent来管理keep-alive的socket,然而我发现当我设置keepAliveMsecs不管多小，后面的请求都会共用第一个socket，请问这是怎么回事儿呢？

const http = require('http'); const url = require('url');

let options = url.parse('http://localhost:9009'); options.headers = { 'connection':'keep-alive' } options.agent = new http.Agent({ keepAlive: true, keepAliveMsecs: 20 }); console.log(options) let sockets = []; function request(){ http.get(options,(res)=>{ console.log(res.headers); res.pipe(process.stdout); }).on('socket',socket=>{ if(sockets.indexOf(socket) === -1){ console.log('new socket created'); sockets.push(socket); } else { console.log('share the socket!'); } }) }

setInterval(request,3000)