how to prevent bfcache

bfcache-test.js

// modified from https://mixmax.com/blog/chrome-back-button-cache-no-store

/**
 * Run this by downloading this script to your computer, then:
 * 1. $ npm install express
 * 2. $ node thisscript.js
 * 3. Open localhost:8030/nocache and then localhost:8030/nostore
 */

const app = require('express')()

app.get('/nocache', function(req, res) {
  res.setHeader('Cache-Control', 'no-cache')
  res.send(`
${new Date().toString()}<br />
<div id="api"></div><br />
<script>fetch(location.pathname + '/api').then(r => r.text()).then(r => document.getElementById('api').textContent = r)</script>
<a href="https://mixmax.com">Click to navigate away and then press Back. It will show the same timestamp.</a>
`)
})

app.get('/nocache/api', function(req, res) {
  res.setHeader('Cache-Control', 'no-cache')
  res.send(new Date().toString())
})

app.get('/nostore', function(req, res) {
  res.setHeader('Cache-Control', 'no-cache, no-store')
  res.send(`
${new Date().toString()}<br />
<div id="api"></div><br />
<script>fetch(location.pathname + '/api').then(r => r.text()).then(r => document.getElementById('api').textContent = r)</script>
<a href="https://mixmax.com">Click to navigate away and then press Back. It will show the same timestamp.</a>
`)
})

app.get('/nostore/api', function(req, res) {
  res.setHeader('Cache-Control', 'no-cache, no-store')
  res.send(new Date().toString())
})

app.listen('8030')