Comment 5 for bug 1416179

The requested feature consists of two part: set (configure) the get (list) and retrieve the list. We can discuss two separately.

Regarding "get", it is useful to me.
As Horizon or other external system which calls Neutron API, it is useful that neutron provides an API to retrieve available values or value ranges (provider types in this case). Without this feature, Horizon or other system needs to maintain the same list in their configurations. In fact, Horizon maintains network provider lists in its settings. This is completely a work around.
Of course, if we expose this kind of list, we need an appropriate policy.json.
If only administrators can specify some information, it should be limited to administrators in GET API too.
We already expose provider-list or flavor-list for users. In my understanding, this feature request is just an admin version of this.

Regarding "set", I don't see a specific use case at now.
More input would be appreciated.