Using _catalog in an API call to the OpenShift Container Registry throws a 400 error

Issue

• Trying to access the container registry catalog api to list all the docker images in the OpenShift internal registry throws an HTTP 400 error:

  # curl -kv -u username https://registry.openshift.example.com:5000/v2/_catalog
  Enter host password for user 'username':
  [...]
  < HTTP/1.1 400 Bad Request
  < Docker-Distribution-Api-Version: registry/2.0
  < Date: Mon, 18 Sep 2017 20:54:19 GMT
  < Content-Length: 0
  < Content-Type: text/plain; charset=utf-8
  < 
  * Connection #0 to host registry.openshift.example.com left intact