I tried the HTTPS now. The website is currently writing the following error message:
{"jsonrpc":"2.0","id":null,"error":{"code":-32603,"message":"Internal Error","data":{"error_id":"b6aa41c0-c3c0-4d1b-9dc2-1eee691879f0","jussi_request_id":"000804972750537071"}}}
It is not a website, it is an API node to serve data for other applications. This is the expected behavior.
Now I understand. It is visible that I am not a software developer. At least today I learned something new. Thank you for the explanation.
Have a nice day. All the best. Greetings and much love from Hungary.