WSO2 ESB - transform a HTTP 202 accepted response - wso2

Question

The Endpoint_BPS_CreateCaseService/UpdateCaseService endpoints below both point to one-way BPEL services running on WSO2 BPS. WSO2 BPS returns a HTTP 202 accepted message instantly when they are invoked.
The client application that I am using will throw a fault if it does not get a valid SOAP envelope as a response so I'm going to use a proxy service in ESB to wrap around the BPEL process.
How do I use a WSO2 ESB proxy service to forward a SOAP envelope to Endpoint_BPS_* below and then return a SOAP envelope response to my client app?
I also want to execute the faultSequence "ProcessFault" if either endpoint is unavailable or times out. I previously used the OUT_ONLY to get around the response issue above but it means I can't detect endpoint problems. Unless it is possible to do both somehow?
Another thing I've tried is cloning the message but this was a bit messy.
Any help greatly appreciated
<proxy xmlns="http://ws.apache.org/ns/synapse" name="BPSProxyService" transports="https,http" statistics="disable" trace="enable" startOnLoad="true">
<target faultSequence="ProcessFault">
<inSequence>
<log level="full">
<property name="MESSAGE" value="BEGIN BPSProxyService" />
</log>
<switch source="//*[local-name()='Operation']">
<case regex="create">
<send>
<endpoint key="Endpoint_BPS_CreateCaseService" />
</send>
</case>
<case regex="update">
<send>
<endpoint key="Endpoint_BPS_UpdateCaseService" />
</send>
</case>
</switch>
</inSequence>
<outSequence>
<property name="HTTP_SC" value="200" scope="axis2" />
<class name="esb.mediators.InjectSOAPEnvelope" />
<log level="full">
<property name="MESSAGE" value="END BPSProxyService" />
</log>
<send />
<drop />
</outSequence>
</target>
<publishWSDL key="common/bpsproxyservice/bpsproxyservice.wsdl">
<resource location="schema.xsd" key="common/schema_v2.xsd" />
</publishWSDL>
</proxy>

Answer 1

When you receive a 'HTTP/1.1 202 Accepted' response from your backend like BPS in the outSequence of your Proxy Service, then you need the <property name="SC_ACCEPTED" value="false" scope="axis2"/> statement to modify the '202'-response into something else.
Example:
<property name="SC_ACCEPTED" value="false" scope="axis2"/>
<property name="HTTP_SC" value="200" scope="axis2"/>
<payloadFactory media-type="xml">
<format>
<response>
<result>OK</result>
</response>
</format>
<args/>
</payloadFactory>
<send/>
The response is transformed into 'HTTP/1.1 200 OK' with a response message.

Answer 2

Add the "FORCE_SC_ACCEPTED" parameter with the "OUT_ONLY" in the inSequence of the proxy service as follows.
<property name="FORCE_SC_ACCEPTED" value="true" scope="axis2" type="STRING"/>
<property name="OUT_ONLY" value="true" scope="default" type="STRING"/>
For more information use the following article:
http://mohanadarshan.wordpress.com/2013/05/05/out_only-scenario-in-proxy-service-wso2-esb/