Settings and their values. You must be a superuser or have
setting permission to do this.
For non-superusers, a list of visible settings and values can be retrieved using the /api/session/properties endpoint.
Fetch a single
keystring with length >= 1
Settings values. If called by a non-superuser, only user-local settings can be updated.
Setting. If called by a non-admin, only user-local settings can be updated.
This endpoint can also be used to delete Settings by passing
keyvalue must be a non-blank string.