WSO2 get PDF from request - pdf

Question

I need to get a pdf from a request to my WSO2 esb. This is my scenario:
Request:
CMS -- Request ----> wso2 ESB ----> backend
Response:
CMS <--- (PDF) --- wso2 ESB <--- PDF Byte Array --- backend
I think that I need to use something like 'aplication/pdf' but when I try to do it, my ESB throws a java error. The following is my code:
<api xmlns="http://ws.apache.org/ns/synapse" name="test" context="/test">
<resource methods="GET" uri-template="/myService">
<inSequence>
<call>
<endpoint>
<http method="get" uri-template="http://backendService/getPDF""></http>
</endpoint>
</call>
<loopback/>
</inSequence>
<outSequence>
<property name="messageType" value="application/pdf" scope="axis2"/>
<property name="ContentType" value="application/pdf" scope="axis2" type="STRING"></property>
<send/>
</outSequence>
<faultSequence></faultSequence>
</resource>
</api>
Any idea?
--- SOLUTION ---
It was really easy and stupid, but I post my solution to avoid that someone waste time in the future:
<api xmlns="http://ws.apache.org/ns/synapse" name="test" context="/test">
<resource methods="GET" uri-template="/myService">
<inSequence>
<send>
<endpoint>
<http method="get" uri-template="http://backendService/getPDF""></http>
</endpoint>
</send>
</inSequence>
<faultSequence></faultSequence>
</resource>
</api>
With this code I just returns the same request that I do to the server, so I get my PDFs files :D