Help with webhook notifications to apprise

I have apprise-api running for notification, and wanted to set up webhook notifications. I can't get even the simplest notifications to work, I get this error



Testing with curl or other API testing tools sends the notification just fine to the apprise endpoint. I can't figure out what's wrong, and don't know where to look for log information so I can troubleshoot this better (I can't tell if proxmox is doing something unexpected with the request)



Can I get any...

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