How to set the HTTP Keep-Alive timeout in a nodejs server

Solution 1:

For Express 3:

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

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.
});

Solution 2:

To set keepAliveTimeout on the express server do:

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

server.keepAliveTimeout = 30000;

Solution 3:

For Node.js 10.15.2 and newer with express, only server.keepAliveTimeout was not enough. We also need to configure server.headersTimeout longer than server.keepAliveTimeout.

server.keepAliveTimeout = 30000; 
// Ensure all inactive connections are terminated by the ALB, by setting this a few seconds higher than the ALB idle timeout
server.headersTimeout = 31000; 
// Ensure the headersTimeout is set higher than the keepAliveTimeout due to this nodejs regression bug: https://github.com/nodejs/node/issues/27363