RemoteAPI: What is the `/v1/session/chat` JSON Format?

So checking out request from the vrage remote client, it sends chat messages as `application/json` as the remote API wants, but actually sends a `text/plain` body? It's not JSON even though the headers say it's supposed to be.

I was expecting to send something like `{"message": "My message"}` but it would never work. But sending `My message` would work...

Is there a JSON format it will accept and the plain text is just a fallback?
Can I set the user to be Server and not Good.bot?
Can whispers just whisper a user and not also post in global?
--- Automerge ---
Also as a heads up, I was searching what people in in medieval engineers, and using

Code:

{
	"RecipientIdentityId": null,
	"Message": "API Test"
}

Doesn't seem to work either. The server returns:

{"error":{"message":"A generic server error occurred."},"meta":{"apiVersion":"1.0","queryTime":0.29500000000000004}}