506 Variant Also Negotiates

We configured ourselves into a circle.

What it properly means

An internal configuration error: the chosen variant is itself set up to do content negotiation, so it is not a proper end point.

Class
5xx Server error: we fucked up
Defined in
RFC 2295

Get one yourself

This endpoint really answers with 506. Point your client at it and see what it does.

curl -i https://httpcodes.dev/api/506