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[Chris Dent <cdent+lp@xxxxxxxxxxxxx>]

** Changed in: nova/pike
       Status: Fix Committed => Fix Released

** Changed in: nova
       Status: Confirmed => Fix Committed

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https://bugs.launchpad.net/bugs/1771325

Title:
  placement trait and inventory handler use nonstandard HTTP error
  message details

Status in OpenStack Compute (nova):
  Fix Committed
Status in OpenStack Compute (nova) pike series:
  Fix Released
Status in OpenStack Compute (nova) queens series:
  Fix Released

Bug description:
  DELETE /traits/<standard trait name>

  Actual
  ------

  {"errors": [{"status": 400, "request_id": "req-b30e30ba-9fce-403f-
  9f24-b6e32cd0b8c9", "detail": "Cannot delete standard trait
  HW_GPU_API_DXVA.\n\n   ", "title": "Bad Request"}]}

  Expected
  --------

  {"errors": [{"status": 400, "request_id": "req-3caa15be-a726-41f2
  -a7cb-f4afb3c97a44", "detail": "The server could not comply with the
  request since it is either malformed or otherwise incorrect.\n\n
  Cannot delete standard trait HW_GPU_API_DXVA.  ", "title": "Bad
  Request"}]}

  Most of the placement wsgi code passes one positional argument to the
  constructor of the  webob.exc.HTTPXXX exception classes but the trait
  [1] and inventory handlers uses the 'explanation' kwargs. As the above
  example shows this leads to different behavior. This inconsistency
  leads to incorrect behavior in osc placement client [2].

  [1] https://github.com/openstack/nova/blob/ae131868f71700d69053b65a0a37f9c2d65c3770/nova/api/openstack/placement/handlers/trait.py#L133
  [2] https://github.com/openstack/osc-placement/blob/2357807c95d74afc836852e1c54f0631c6fd2d60/osc_placement/http.py#L35

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