Can we trigger backend code deployed on server via external rest tool from agent ai studio?

Can we trigger backend code deployed on server via external rest tool from agent ai studio? As the code can be triggered from postman tool similarly can't we trigger it from agent using external REST tool, which has option of post method.

I have tried this scenario but seems to be errored. If some one tried this scenario and if its working let me know. I am getting the below error when tried.

what is this error: { "responseStatus": 502, "response": { "type": "vb://network/ssl/handshake", "title": "SSL Error", "detail": "A problem was reported making a SSL connection because of 'Remote host terminated the handshake'.", "status": 502 } }