title: Curl request to Openstack API returns 403 forbidden error
body: <p>I am using openstack api as given below:</p>
  
  <p>curl -i -X GET "<a href="https://cloud.lab.fiware.org:5000/v3/users?name=username" rel="nofollow noreferrer">https://cloud.lab.fiware.org:5000/v3/users?name=username</a>" -H "X-Auth-token:token"</p>
  
  <p>However, it doesn't return me any result. It gives 403 error code as Forbidden.</p>
  
  <p>Please find the below response</p>
  
  <p>HTTP/1.1 403 Forbidden
  Server: nginx/1.4.6 (Ubuntu)
  Date: Wed, 30 Jan 2019 10:55:04 GMT
  Content-Type: application/json
  Content-Length: 136
  Connection: keep-alive
  Vary: X-Auth-Token
  X-Distribution: Ubuntu
  X-Openstack-Request-Id: req-9948991c-83f2-452b-b942-2ff3d5a9c5eb</p>
  
  <p>{"error": {"message": "You are not authorized to perform the requested action: identity:list_users", "code": 403, "title": "Forbidden"}}</p>