server-timing-example.js

const http = require('http');

function requestHandler(request, response) {
	const headers = {
		'Server-Timing': `
			lb=18; "Load Balancer",
			server-3=104; "Server #3 Startup",
			db-read=187; "Database Read",
			aws-download=317; "AWS Content Download",
			db-write=218; "Database Write",
			templating=48; "Templating plugin"
		`.replace(/\n/g, '')
	};

	response.writeHead(200, headers);

	response.write('Lorem ipsum dolor sit amet, consectetur adipisicing elit. Consequatur incidunt aliquam ipsam. Possimus illum repellendus hic, pariatur dolorem, laborum blanditiis ut cumque exercitationem facilis culpa quaerat error molestias aperiam harum.');

	return setTimeout(() => response.end(), 892);
}

http.createServer(requestHandler).listen(3000);