While generating Ceilometer usage report, getting error message "ConnectionError: ('Connection aborted.', BadStatusLine("''",))"

Issue

• When generating utilization report in ceilometer using ceilometer statistics , encountered below errors:

  [stack@director ~]$ ceilometer statistics --meter memory.usage --query 'resource_id=5868e201-a933-48f7-aa47-96aeef82908d;timestamp>2017-05-01T00:00:00;timestamp<=2017-05-10T00:00:00'
  ('Connection aborted.', BadStatusLine("''",))
  
  [stack@director ~]$ ceilometer statistics --meter memory.usage --query 'resource_id=5868e201-a933-48f7-aa47-96aeef82908d;timestamp>2017-05-01T00:00:00;timestamp<=2017-05-15T00:00:00'
  HTTPConnectionPool(host='10.xx.xx.160', port=8777): Read timed out. (read timeout=600)