- Plesk Onyx
A Cron job to fetch a URL sends a notification email as unsuccessful when URL returns the status code 204
Although the 204 code, means success but with no content, Plesk takes it as an error code and thus the email notification is sent.
A change request in Plesk with ID PPPM-9565 was created which will be included in future product updates.
As a workaround, disable the email notifications for the affected Cron job.