Throttler

All,

I am evaluating Camel to be a proxy/gateway to REST internal end points.
I have set it up as a servlet on Tomcat and configured for http proxy
and it is working. I also wanted to implement throttling rules using
throttler. So, I have used the sample available in documentation to
restrict 3 requests in 10 seconds. The behavior that I have noticed is
that it would "delay" the response after reaching the limit. However, I
am wondering if there is a way to "block" the client for a certain
period of time by sending a JSON response that the access is blocked as
limits exceeded. Should I need to customize (or extend) the throttle to
achieve this or somebody already got this requirement working? Thanks in
advance.