While I am using call out mediator in wso2 esb , with DSS Endpoint I am getting the request only, I am not getting response, even I put log in the out sequence. Here I am sending my proxy service.
<proxy xmlns="http://ws.apache.org/ns/synapse"
name="Binaryformat"
transports="https http"
startOnLoad="true"
trace="disable">
<description/>
<target>
<inSequence>
<property name="messageType" value="application/json" scope="axis2"/>
<property name="ContentType" value="application/json" scope="axis2"/>
<log level="full">
<property name="M1" value="*************Callout PROXY*************"/>
</log>
<callout serviceURL="http://192.168.1.201:9769/services/emp_DataService/">
<source type="envelope"/>
<target key="response"/>
</callout>
<log level="full">
<property name="Status" expression="get-property('response')"/>
</log>
<header name="To" action="remove"/>
<property name="RESPONSE" value="true"/>
<!--<property name="OUT_ONLY" value="true"/>-->
<send/>
</inSequence>
<outSequence>
<log level="full">
<property name="Status" expression="get-property('response')"/>
</log>
<payloadFactory media-type="xml">
<format>
<response>outonly</response>
</format>
<args/>
</payloadFactory>
<property name="OUT_ONLY" value="true"/>
<send/>
</outSequence>
</target>
</proxy>
callout mediator is synchronous, it will return the response in the same sequence (your inSequence, by doing a blocking call) : your outSequence is unnecessary.
however, you should add a faultSequence to log any error
you should use tcpmon (launch tcpmon in ESB_HOME/bin) between ESB and your endpoint to verify request content going to your service and verify if you obtain a response from your service.