camel 2.14.1 rest component - read headers

[Desu, Kishore Kumar]

Hi,

I am trying to read request headers using Apache camel 2.14.1 "Rest" component. 
Below is my spring dsl to configure rest component. I am using restlet as my 
endpoint.
<rest path="/a">
            <get uri="/{b}">
                <route>
                    <setBody>
                        <simple>${header.b}:${header.headerName}</simple>
                    </setBody>
                    <to 
uri="activemq:queue:requestQueue?replyTo=responseQueue"/>
                </route>
            </get>
</rest>

My restlet configuration is,
<bean id="RestletComponent" class="org.restlet.Component" />
      <bean id="RestletComponentService" 
class="org.apache.camel.component.restlet.RestletComponent">
        <constructor-arg ref="RestletComponent" />
</bean>

When I call this service(http//localhost:8081/test/a/b) by setting the headers 
(headerName=1) using postman plugin, then my camel configuration is unable to 
read header values.
As per the documentation, we can read headers using ${in.header.headerName}, 
which is returning empty.
Please help me to read header values in my case.
Thanks,
Kishore Kumar Desu.