**Examples**

(HEAD) Retrieve information about the object with identifier "ABC123"::

  curl -I http://mn1.dataone.org/mn/v1/object/ABC123

  HTTP/1.1 200 OK
  Last-Modified: Wed, 16 Dec 2009 13:58:34 GMT
  Content-Length: 10400
  Content-Type: application/octet-stream
  DataONE-ObjectFormat: eml://ecoinformatics.org/eml-2.0.1
  DataONE-Checksum: SHA-1,2e01e17467891f7c933dbaa00e1459d23db3fe4f
  DataONE-SerialVersion: 1234


(HEAD) An error response to a describe() request for object "IDONTEXIST"::

  curl -I http://mn1.dataone.org/mn/v1/object/IDONTEXIST

  HTTP/1.1 404 Not Found
  Last-Modified: Wed, 16 Dec 2009 13:58:34 GMT
  Content-Length: 1182
  Content-Type: text/xml
  DataONE-Exception-Name: NotFound
  DataONE-Exception-DetailCode: 1380
  DataONE-Exception-Description: The specified object does not exist on this node.
  DataONE-Exception-PID: IDONTEXIST