When using external js files, browsers can be forced to reload the files. See here.
Recently, I've found out that INLINE scripts are also cached, at least in Chrome, version 80.0.3987.132, example of snippet:
<html>
<head>
<script>alert("I am cached!");</script>
</head>
<body>
<script>alert("Me too!");</script>
</body>
</html>
What's the way of refreshing inline scripts?
Update 1: I do have to mention that the webserver returning the content is using HTTP 2.0
Update 2: A solution that works is to have an auxiliary script as base and when the page loads get the "real" script content through ajax or websocket then append it to head like so:
function addScript(content){
let s = document.createElement('script');
s.innerHTML = content;
document.head.appendChild(s);
}
This does the job but its not optimal as it needs more requests than necessary.
Update 3: Headers sent from backend neither seem to work, using these headers:
Header().Set("Cache-Control", "no-cache, no-store, must-revalidate") // HTTP 1.1.
Header().Set("Pragma", "no-cache") // HTTP 1.0.
Header().Set("Expires", "0") // Proxies.
Update 4: As per Jinxmcg's answer, the doc https://v8.dev/blog/code-caching-for-devs Don’t change URLs mentions:
we may one day decide to associate caches with the source text rather than source URL, and this advice will no longer be valid.
Probably that day has come and is also applied to inline scripts.
Thank you everyone for participating
Final Solution (works at least under my circumstances):
1 Backend headers:
w.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate, max-age=0") // HTTP 1.1.
w.Header().Set("Pragma", "no-cache") // HTTP 1.0.
w.Header().Set("Expires", "0") // Proxies.
2 Random string in HTML, JS and CSS, example:
<html>
<head>
<style>
--cache-color: #8528cc; //Random hex color generated by backend
</style>
<script>
console.log("<?php echo date(); ?>");
alert("I am cached!");
</script>
</head>
<body>
<div>Hidden DIV with a random value: <?php echo date(); ?></div>
<script>
console.log("<?php echo date(); ?>");
alert("Me too!");
</script>
</body>
</html>
