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Hello stable maintenance core team,

We recently noticed that an Image API call implemented in Yoga, which 
returns no content, is returning a 200 instead of a 202 (as the design 
[0] had specified).  We would like to correct this in master (Zed 
development) and in the stable/yoga branch.  Here are our reasons why we 
think this is a legitimate exception to the no-http-api-changes-backport 
policy:

(1) Even ignoring the lack of a response body, a 200 (OK) is misleading 
because operation initiated by the PUT /v2/cache/{image_id} request may 
not succeed.  A 202 (Accepted) signals more clearly to the operator that 
some followup is necessary to be sure the image has been cached.

(2) This is intended as an admin-only API call; the default policy is 
admin-only.  So it has not been exposed to end-users.

(3) The change [1] was first released in Yoga and there has not been 
much time for admins to begin consuming this feature.  Further, there 
has not yet been a release from stable/yoga after glance 24.0.0.

For these reasons, we request that the glance team be allowed to make 
this change.

Thank you for considering this proposal!


[0] 
https://opendev.org/openstack/glance-specs/blame/commit/2638ada23d92f714f54b71db00330e4a6c921beb/specs/xena/approved/glance/cache-api.rst#L153
[1] https://review.opendev.org/c/openstack/glance/+/792022