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I am trying to access. All required modules are included, rights granted. so does not work. /user/register?_format=hal_json

I get a message:

{"message":"Not acceptable format: hal_json"}

In RestUi settings, hal_json format is enabled.

And in the log:

Symfony\Component\HttpKernel\Exception\NotAcceptableHttpException: Not acceptable format: hal_json in Drupal\Core\EventSubscriber\RenderArrayNonHtmlSubscriber->onRespond() (line 30 of .../web/core/lib/Drupal/Core/EventSubscriber/RenderArrayNonHtmlSubscriber.php).

Drupal 9.0 and Drupal 8.8.4

1

please add at header:

 Content-Type : application/hal+json
0

Did you check, maybe JSON data from the frontend doesn't cover inside of JSON.stringify(...) and you try to send regular data which not serialized for sending?

I advice to make sure you stringify data before sending:

const data = {"some":"value"} JSON.stringify(data)

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