Hi,
Render terminates SSL upstream of your running service. Once the request is inside the Render network it is passed from the proxy to your instance over HTTP, so your code only needs to be configured to accept HTTP (not HTTPS) requests.
It’s hard to provide any assistance with your error without any details. Please could you share some specific details of the issue you are experiencing that may help us troubleshoot it with you e.g. the URL you’re requesting.
If you don’t want to share these details on the community forum, please feel free to raise a ticket from the “Help” or “Contact Support” links while logged into the Dashboard.
Alan