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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

Added nova since it has the exact same code.

** Also affects: nova
   Importance: Undecided
       Status: New

** Changed in: nova
       Status: New => Confirmed

** Changed in: nova
   Importance: Undecided => Low

** Changed in: nova
     Assignee: (unassigned) => Matt Riedemann (mriedem)

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https://bugs.launchpad.net/bugs/1749983

Title:
  Unhelpful error message when trying to force detach and content-type
  header is missing

Status in Cinder:
  In Progress
Status in OpenStack Compute (nova):
  In Progress

Bug description:
  I was trying to force detach a volume using curl like so:

  curl -d '{"os-force_detach": {}}' -H "accept: application/json" -H "x
  -auth-token: $token"
  http://199.204.45.19/volume/v3/e9d773beeef2435eb59f7c6eeaf685a9/volumes/126c8d4b-c582
  -484a-8c09-fe901a7dc17f/action

  And I'd get this error message back:

  {"badRequest": {"message": "There is no such action: None", "code":
  400}}

  When I dug into the cinder-api logs, I saw this:

  Feb 16 16:08:49 queens devstack@c-api.service[1549]: DEBUG
  cinder.api.openstack.wsgi [None req-c7279a60-f7ba-
  4a11-98f2-8fa2b2ec281d demo demo] Unrecognized Content-Type provided
  in request {{(pid=1723) get_body
  /opt/stack/cinder/cinder/api/openstack/wsgi.py:724}}

  Changing the 'accept' header to 'content-type' fixed it:

   curl -d '{"os-force_detach": {}}' -H "content-type: application/json"
  -H "x-auth-token: $token"
  http://199.204.45.19/volume/v3/e9d773beeef2435eb59f7c6eeaf685a9/volumes/126c8d4b-c582
  -484a-8c09-fe901a7dc17f/action

  I get a policy error since I'm not an admin (default policy rule on
  this API is admin-only), but it went through properly:

  {"forbidden": {"message": "Policy doesn't allow
  volume_extension:volume_admin_actions:force_detach to be performed.",
  "code": 403}}

  The bug is that the missing content-type results in a very unhelpful
  error message.

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