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[Stephen Finucane <2091095@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Typically, 'GET /resource/id' returns a HTTP 404 (Not Found) if 'id'
doesn't exist (and a HTTP 403 (Forbidden) if the user doesn't have
permission to access it). The 'os-quota-sets' API is an exception to
this rule. A quota set is identified by a project ID, but you get a HTTP
400 (Bad Request) if the project doesn't exist.

This is difficult for clients to process, since HTTP 400 (Bad Request)
is also used for "real" bad request issues like invalid query parameters
(i.e. schema validation). We should correct this. This is allowed by the
microversion guidelines [1].

[1]
https://docs.openstack.org/nova/latest/contributor/microversions.html#f2

** Affects: nova
     Importance: Medium
     Assignee: Stephen Finucane (stephenfinucane)
         Status: New


** Tags: api api-ref

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https://bugs.launchpad.net/bugs/2091095

Title:
  'GET /os-quota-sets/foo' returns HTTP 400 instead of HTTP 404 if foo
  doesn't exist/was deleted

Status in OpenStack Compute (nova):
  New

Bug description:
  Typically, 'GET /resource/id' returns a HTTP 404 (Not Found) if 'id'
  doesn't exist (and a HTTP 403 (Forbidden) if the user doesn't have
  permission to access it). The 'os-quota-sets' API is an exception to
  this rule. A quota set is identified by a project ID, but you get a
  HTTP 400 (Bad Request) if the project doesn't exist.

  This is difficult for clients to process, since HTTP 400 (Bad Request)
  is also used for "real" bad request issues like invalid query
  parameters (i.e. schema validation). We should correct this. This is
  allowed by the microversion guidelines [1].

  [1]
  https://docs.openstack.org/nova/latest/contributor/microversions.html#f2

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