How does the Accept-Encoding header interact with the Vary header when set in PHP?

When using the Accept-Encoding header in PHP, it's important to also set the Vary header to inform caching mechanisms that the response can vary based on the Accept-Encoding header. This ensures that cached responses are appropriately served based on the client's preferred encoding type. 

<?php
header('Vary: Accept-Encoding');

Keywords

Accept-Encoding Vary header PHP HTTP headers Content negotiation

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