400

Bad request. A 400 response usually indicates invalid or missing required parameters, but can trigger for many reasons.
In the example below, deletion of a policy failed for some reason.

{  
  "type": "/imaging/error-types/IVM_9000",  
  "title": "Bad Request",  
  "instance": "/imaging/error-instances/bf39e042-9d21-4ef3-88f1-eacf487d12f8",  
  "status": 400,  
  "detail": "Policy '.auto' cannot be deleted.",  
  "requestId": "5fb7efe81b819c76"  
}