How to replace DefaultHeaderFilterStrategy

Question

I know I can set the HeaderFilterStrategy for a particular end-point, but...

How does one override the DefaultHeaderFilterStrategy with a custom strategy that will apply to all routes?

We are using Camel's Servlet Listener. Can we supply something in the configuration (documented here) to replace the DefaultHeaderFilterStrategy with our own class?

Answer 1

You could create your own implementation of HeaderFilterStrategy class and refer to it in the endpoint configuration

<lang:groovy id="MyHeaderFilter">
    <lang:inline-script>
        import org.apache.camel.Exchange
        import org.apache.camel.spi.HeaderFilterStrategy

        class MyHeaderFilter implements HeaderFilterStrategy {
            public boolean applyFilterToCamelHeaders(String headerName, Object headerValue, Exchange exchange) {
                return false
            }
            public boolean applyFilterToExternalHeaders(String headerName, Object headerValue, Exchange exchange) {
                return !(headerName in ['desirableHeaderName'])
}
        }
    </lang:inline-script>
</lang:groovy>

and then

<to uri="activemq:dummy?headerFilterStrategy=#MyHeaderFilter"/>

UPD.
It is also possible to set custom header filter to the whole component

<bean id="activemq" class="org.apache.activemq.camel.component.ActiveMQComponent">
  <property name="headerFilterStrategy" ref="MyHeaderFilter"/>
</bean>