"Unknown Action Type" exception when attempting to post a bad *match*
Due to a copy-paste mistake, I tried to post my nlsdn action to the /match endpoint. This obviously didn't work, but the error that came back was that I had posted a bad action. When the action itself is fine, and the endpoint is wrong, this is a confusing error.
Ref: https://gitlab.flux.utah.edu/safeedge/nlsdn/blob/master/src/nlsdn/server/sdn.py#L216