Loadbalancing of Bluecoat proxysg and failover of internet links

I have got a Big IP LTM LTM loadbalancing 2 Bluecoat proxy device using icmp ping health check but I want to go beyond this like check the health of Internet access through Bluecoat device.What kind of health check do I use at node level.is transparent http health monitor usable?

 

 

Transparent: When an alternate Destination is specified and the Transparent option is selected, the monitor traffic will be sent to the alternate L3 destination via the pool member's L2 address . Useful for verifying gateways and proxies. (Pool member must be able to forward traffic as expected.)Health Monitor

 

https://devcentral.f5.com/wiki/advdesignconfig.HealthMonitor.ashx