nova/releasenotes/notes/idempotent-put-resource-cla...

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---
features:
- |
The 1.7 version of the placement API changes handling of
`PUT /resource_classes/{name}` to be a create or verification of the
resource class with `{name}`. If the resource class is a custom resource
class and does not already exist it will be created and a ``201`` response
code returned. If the class already exists the response code will be
``204``. This makes it possible to check or create a resource class in one
request.