glance/releasenotes/notes/range-header-request-83cf11...

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---
fixes:
- |
Glance had been accepting the Content-Range header for GET v2/images/{image_id}/file requests,
contrary to RFC 7233.
Following RFC 7233, Glance will now:
* Accept the Range header in requests to serve partial images.
* Include a ``Content-Range`` header upon successful delivery of the requested partial content.
Please note that not all Glance storage backends support partial downloads. A Range request to a
Glance server with such a backend will result in the entire image content being delivered
despite the 206 response code.