public void setPingAppendString(String pingAppendString) {
				this.pingAppendString = (pingAppendString != null) ? pingAppendString : "";
		}
Ping implementation if you want to do a "health check" kind of Ping. This
will be a "real" ping. As in a real http/s call is made to this url e.g.
http://ec2-75-101-231-85.compute-1.amazonaws.com:7101/cs/hostRunning

Some services/clients choose PingDiscovery - which is quick but is not a real
ping. i.e It just asks discovery (eureka) in-memory cache if the server is present
in its Roster PingUrl on the other hand, makes an actual call. This is more
expensive - but its the "standard" way most VIPs and other services perform
HealthChecks.

Choose your Ping based on your needs.

@author stonse
ribbon-httpclient/src/main/java/com/netflix/loadbalancer/PingUrl.java