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gkpo avatar Server

Multiple cache headers

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gkpo

So I'm running a drupal site and I'd like the response of a specific URL to be cached:

I've added this code in the PHP function:

  $seconds_to_cache = 3600;
  $ts = gmdate("D, d M Y H:i:s", time() + $seconds_to_cache) . " GMT";
  header("Expires: $ts");
  header("Pragma: cache");
  header("Cache-Control: max-age=$seconds_to_cache");

But the response has the following headers:

cache-control: max-age=3600 <-- Looks like my header
cache-control: must-revalidate, no-cache, private <-- Why is this still here ?
content-encoding: gzip
content-language: fr
content-type: application/json
date: Wed, 09 Feb 2022 11:47:05 GMT
expires: Wed, 09 Feb 2022 12:47:05 GMT <-- also looks like my header
expires: Sun, 19 Nov 1978 05:00:00 GMT <-- Why is this still here ?

My headers seem to be present, but they don't seem to override the default headers which are just below. So my question: Are multiple headers a problem ? Which one is taken into account ? How can I make it clear to Apache that I want to override the default headers ?

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Tero Kilkanen
I think the additional header comes from Drupal. You need to find a Drupal compatible way to control the cache headers. Drupal should have internal APIs to control HTTP cache headers.
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