Errors such as the following appear in the web server logs:
2022-09-13 14:51:10 Error 220.127.116.11 [client 18.104.22.168] ModSecurity: JSON support was not enabled [hostname "example.com"] [uri "/api/"] [unique_id "YyCKzaaaaaaDGAzsvjEgJwAAAAk"] Apache error
API queries using JSON format are not processed by the web application.
Disable ModSecurity rule 77350039 or 77316736 (see in the logs) as per documentation.
This solution does not have an impact on server security since this rule is only used for optimizing data processing.
ModSecurity package provided by Plesk does not have built-in JSON support.