Question

I have example of code below.

<script type='text/javascript' src='assets/scripts/somescript.php'>.  </script> 

So, will my browser still cache this just by not setting this scripts headers meta tag cache to must-revalidate?

Answer 1

Some browsers are more agressive with default caching than others. However, there are cache control headers you can send to indicate when to reload the code.

header('Expires: ' . date('r', time() + ( 60 * 60 * 24 * 7 * 1 ) ) ); // Expires in 1 week header('Content-Type: application/x-javascript'); 

Is a code-snippet I’ve been known to use.

You can use more fancy stuff like If-Not-Modified headers and ETags, but Expire times are the only ones that eliminate extra server calls.