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Set cache headers for these locations

• {application assets folder}

• {store data folder}/public

• {customer data folder}/public

• {customization assets folder}

Implementing cache busting for customization assets

• Create a PHP file in {customization folder}/system_overrides/releaseNumber.php (or pick any other file name)

• Add a function called getReleaseNumber(), have it return a string of your choosing

• Change it whenever you need to invalidate your static assets.