willfrew/host.html

## host.html
<!DOCTYPE html>
<html>
  <head></head>
  <body>
    <script>
      (function() {
        // 1 or 2
        let i = Math.round(Math.random()) + 1


        console.log(`Loading iframe ${i}`);
        let iframe = document.createElement('iframe');
        iframe.src = `./iframe${i}.html`;
        iframe.name = 'consistent';

        document.body.appendChild(iframe);
      })();
    </script>
  </body>
</html>

## iframe1.html
<!DOCTYPE html>
<html>
  <head>
    <script>
      console.log('IFRAME 1');
    </script>
  </head>
  <body></body>
</html>

## iframe2.html
<!DOCTYPE html>
<html>
  <head>
    <script>
      console.log('IFRAME 2');
    </script>
  </head>
  <body></body>
</html>

## package.json
{
  "name": "iframe-test",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "static-server": "^2.2.1"
  }
}

## server.js
var StaticServer = require('static-server');
var server = new StaticServer({
  rootPath: '.',            // required, the root of the server file tree
  port: 1337,               // required, the port to listen
  cors: '*',                // optional, defaults to undefined
});

server.on('request', function (req, res) {
  let cacheControl = (/host.html/.test(req.path))
    ? 'no-cache, no-store, must-revalidate'
    : 'public, max-age=31536000'

  res.headers = {
    ...res.headers,
    'Cache-Control': cacheControl,
  };
});

server.start();
	<!DOCTYPE html>
	<html>
	<head></head>
	<body>
	<script>
	(function() {
	// 1 or 2
	let i = Math.round(Math.random()) + 1


	console.log(`Loading iframe ${i}`);
	let iframe = document.createElement('iframe');
	iframe.src = `./iframe${i}.html`;
	iframe.name = 'consistent';

	document.body.appendChild(iframe);
	})();
	</script>
	</body>
	</html>
	<!DOCTYPE html>
	<html>
	<head>
	<script>
	console.log('IFRAME 1');
	</script>
	</head>
	<body></body>
	</html>
	{
	"name": "iframe-test",
	"version": "1.0.0",
	"description": "",
	"main": "index.js",
	"scripts": {
	"test": "echo \"Error: no test specified\" && exit 1"
	},
	"author": "",
	"license": "ISC",
	"dependencies": {
	"static-server": "^2.2.1"
	}
	}
	var StaticServer = require('static-server');
	var server = new StaticServer({
	rootPath: '.', // required, the root of the server file tree
	port: 1337, // required, the port to listen
	cors: '*', // optional, defaults to undefined
	});

	server.on('request', function (req, res) {
	let cacheControl = (/host.html/.test(req.path))
	? 'no-cache, no-store, must-revalidate'
	: 'public, max-age=31536000'

	res.headers = {
	...res.headers,
	'Cache-Control': cacheControl,
	};
	});

	server.start();