REST response gets cached for guest user requests

Question

I've implemented kind of a page hit counter as REST request. The article page renders a JS into the page that does a jQuery.getJSON to the REST resource later.

So far that works fine. The page is delivered from cache (X-Drupal-Cache:"HIT") and the browser does an extra request to the REST resource (/api/v1/check/l/1?_format=json).

Unfortunately the REST handler is not called for guest user views. Instead, Drupal delivers the cached response. It only works for authenticated users.

For guest I get

Cache-Control:"must-revalidate, no-cache, private"
X-Drupal-Dynamic-Cache:"UNCACHEABLE"

BUT:

X-Drupal-Cache:"HIT"

And the REST handler is not executed. My REST response is

return (new ResourceResponse($rc))->addCacheableDependency(null);

Thanks

Answer 1

This is probably the page cache for anonymous users, which works independently from the dynamic cache.

You can disable it with this command:

\Drupal::service('page_cache_kill_switch')->trigger();

You can trigger this anywhere in your code and it will be valid for any response you send for the request. So this should also work for a REST response.

Answer 2

I have a resource post (for anonymous). The above answers Didn't help me.

The following did :

$response = new ModifiedResourceResponse($result);
return $response;

Read more at ModifiedResourceResponse()

Answer 3

Try add 'addCacheableDependency' to 'ResourceResponse'

$response = new ResourceResponse($result);
$response->addCacheableDependency($result);
return $response;

Create Rest Resource for GET Method in Drupal 8