nova/releasenotes/notes/placement-last-modified-cf4...

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---
features:
- |
Throughout the Placement API, in microversion 1.15, 'last-modified' headers
have been added to GET responses and those PUT and POST responses that have
bodies. The value is either the actual last modified time of the most
recently modified associated database entity or the current time if there
is no direct mapping to the database. In addition,
'cache-control: no-cache' headers are added where the 'last-modified'
header has been added to prevent inadvertent caching of resources.