If you are sitting at a browser, sometimes hitting Shift-Reload or Ctrl-Reload will force getting a fresh copy.
If you always rename images or zip files when you change them, you can safely give them a very long expiry date, e.g. three months.
Unfortunately you can’t specify the expiry date in your HTML (Hypertext Markup Language). Your ISP (Internet Service Provider) needs to apply the expiry date headers based on some sort of rule such as the Apache rule scheme.
When reading files from a website programmatically, you can force a fresh copy rather a faster cached copy with URLConnection.setUseCaches( false ).
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