Hi Willy,
As of url_response probe 4.56, the probe uses curl version 8.9.1.
https://techdocs.broadcom.com/us/en/ca-enterprise-software/it-operations-management/ca-unified-infrastructure-management-probes/GA/monitoring/systems-and-service-response/url-response-url-endpoint-response-monitoring/url-response-troubleshooting.html
If you need or want to dig deeper into the unknown error 247, set the url_response probe loglevel to 5 and logsize to 200000, then please reproduce the issue and open a support case and attach the log files and the url_response.cfg file.
Best Regards,
Steve