gistfile1.xml

<flow name="flow">
    <vm:inbound-endpoint path="test.in"
        exchange-pattern="request-response" />
    <http:outbound-endpoint address="http://www.google.com/"
        method="GET" exchange-pattern="request-response" />
    <choice>
        <when
            expression="#[message.inboundProperties['Content-Type'].contains('text/html')]">
            <logger message="when number one invoked" level="WARN" />
        </when>
        <when
            expression="#[message.inboundProperties['Content-Type'].contains('application/json')]">
            <logger message="when number two invoked" level="WARN" />
        </when>
        <otherwise>
            <logger message="otherwise invoked" level="WARN" />
        </otherwise>
    </choice>
</flow>