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============
API Versions
============
In order to bring new features to users over time, the Placement API
supports microversioning. Microversions allow use of certain features on a
per-request basis via the ``OpenStack-API-Version`` header. For example, to
request microversion 1.10, specify the header::
OpenStack-API-Version: placement 1.10
For more details about Microversions, please reference:
`Microversion Specification
<http://specs.openstack.org/openstack/api-sig/guidelines/microversion_specification.html>`_
.. note:: The maximum microversion supported by each release varies.
Please reference:
`REST API Version History
<https://docs.openstack.org/placement/latest/placement-api-microversion-history.html>`__
for API microversion history details.
List Versions
=============
.. rest_method:: GET /
Fetch information about all known major versions of the placement API,
including information about the minimum and maximum microversions.
.. note:: At this time there is only one major version of the placement API:
version 1.0.
Normal Response Codes: 200
Response
--------
.. rest_parameters:: parameters.yaml
- versions: versions
- id: version_id
- min_version: version_min
- max_version: version_max
- status: version_status
- links: version_links
Response Example
----------------
.. literalinclude:: ./samples/root/get-root.json
:language: javascript
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