Force browser to refresh CSS, JavaScript, etc

by

General solution

Pressing Ctrl + F5 (or Ctrl + Shift + R) to force a cache reload. I believe Macs use Cmd + Shift + R.

PHP

In PHP, you can disable the cache by setting the expiration date to a time in the past with headers:

header("Expires: Tue, 01 Jan 2000 00:00:00 GMT");
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
header("Cache-Control: no-store, no-cache, must-revalidate, max-age=0");
header("Cache-Control: post-check=0, pre-check=0", false);
header("Pragma: no-cache");

Chrome

Chrome’s cache can be disabled by opening the developer tools with F12, clicking on the gear icon in the lower right corner and selecting Disable cache in the settings dialog, like this:

enter image description here
Image taken from this answer.

Firefox

Type about:config into the URL bar then find the entry titled network.http.use-cache. Set this to false.

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