如何在nodejs服务器中设置HTTP Keep-Alive超时 [英] How to set the HTTP Keep-Alive timeout in a nodejs server

问题描述

我实际上正在对ExpressJS服务器进行一些负载测试，我注意到服务器发送的响应包括一个Connection：Keep-Alive标头。据我所知，连接将保持打开，直到服务器或客户端发送Connection：Close标头。

在某些实现中，连接： Keep-Alive标头提供了一个Keep-Alive标题，设置连接超时和通过此连接发送的最大连续请求数。

例如： Keep-Alive：timeout = 15，max = 100

在Express服务器上设置这些参数有什么办法（和它是否相关）？

如果没有，你知道ExpressJS如何处理这个吗？

编辑：
经过一番调查，我发现默认超时是在节点标准http库：

  socket.setTimeout（2 * 60 * 1000）; // 2分钟超时
  

为了更改：

  var http = require（'http'）; 
 
 http.createServer（function（req，res）{
 res.writeHead（200，{'Content-Type'：'text / plain'}）; 
 res。 end（Hello World）; 
}）on（'connection'，function（socket）{
 socket.setTimeout（10000）; 
}）listen（3000）; 
  

无论如何，我仍然看起来有点奇怪，服务器没有发送任何提示客户关于其超时。

Edit2：
感谢josh3736发表评论。

setSocketKeepAlive与HTTP保持活动无关。它是一个TCP级别选项，允许您检测到连接的另一端已经消失。

解决方案

对于Express 3 ：

  var express = require（'express'）; 
 var app = express（）; 
 var server = app.listen（5001）; 
 
 server.listen（3000）; 
 
 server.on（'connection'，function（socket）{
 console.log（一个新的连接是由客户端创建的）; 
 socket.setTimeout 30 * 1000）; 
 // 30秒超时，根据您的需要更改此项
}）
  

I'm actually doing some load testing against an ExpressJS server, and I noticed that the response send by the server includes a "Connection: Keep-Alive" header. As far as I understand it, the connection will remain opened until the server or the client sends a "Connection: Close" header.

In some implementations, the "Connection: Keep-Alive" header comes up with a "Keep-Alive" header setting the connection timeout and the maximum number of consecutive requests send via this connection.

For example : "Keep-Alive: timeout=15, max=100"

Is there a way (and is it relevant) to set these parameters on an Express server ?

If not, do you know how ExpressJS handles this ?

Edit: After some investigations, I found out that the default timeout is set in the node standard http library:

socket.setTimeout(2 * 60 * 1000); // 2 minute timeout

In order to change this:

var http = require('http');

http.createServer(function (req, res) {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end("Hello World");
}).on('connection', function(socket) {
  socket.setTimeout(10000);
}).listen(3000);

Anyway it still looks a little bit weird to me that the server doesn't send any hint to the client concerning its timeout.

Edit2: Thanks to josh3736 for his comment.

setSocketKeepAlive is not related to HTTP keep-alive. It is a TCP-level option that allows you to detect that the other end of the connection has disappeared.

解决方案

For Express 3:

var express = require('express');
var app = express();
var server = app.listen(5001);

server.listen(3000);

server.on('connection', function(socket) {
  console.log("A new connection was made by a client.");
  socket.setTimeout(30 * 1000); 
  // 30 second timeout. Change this as you see fit.
})

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