Returns the health status of the Swift service and cluster.
This call has no restrictions.
> GET /healthcheck HTTP/1.1 > Host: 192.168.0.0:9024 > User-Agent: curl/7.43.0 > Accept: */* >
< HTTP/1.1 200 OK < Date: Tue, 19 Dec 2017 17:48:12 GMT < X-Trans-Id: tx000000000000000000000-0000000000 < Content-Type: text/plain < Content-Length: 2 < * Connection #3 to host 192.168.0.0 left intact OK