WSO2 ESB: Registering and Transforming Response from REST REST Service Back to SOAP
I am working on a WSO2 ESB POC for my company, which involves providing an internal RESTful service over a SOAP endpoint on an ESB. I've read all the threads and blog posts related to SOAP-REST mediation but couldn't find an answer. The RESTful service returns the message format "application / rdf + xml". Here is my sequence:
<proxy xmlns="http://ws.apache.org/ns/synapse" name="CQProxy" transports="https,http" statistics="disable" trace="disable" startOnLoad="true">
<target>
<inSequence>
<send>
<endpoint>
<address uri="http://<MYURL>/cqweb/oslc/repo/eraprototype/db/CQT_T/simpleQuery/16783484?oslc.select=dcterms:title,cq:CM_Label,dcterms:type,cq:Assigned_To,oslc_cm:status,cq:AutoDeployment,cq:SentToEADS_By&oslc.where=oslc:shortTitle=CQT_T00000131" format="get"/>
<property xmlns:ns="http://org.apache.synapse/xsd" name="Authorization" expression="fn:concat('Basic ', base64Encode('user:password'))" scope="transport"/>
<property name="OSLC-Core-Version" value="2.0" scope="transport"/>
<property name="Accept" value="application/rdf+xml" scope="transport"/>
</endpoint>
</send>
</inSequence>
<outSequence>
<log level="full"/>
<send/>
</outSequence>
</target>
<publishWSDL key="gov:/services/cqproxy/CQProxy.wsdl">
<resource location="CQProxy.xsd" key="gov:/services/cqproxy/CQProxy.xsd"/>
<resource location="eads_ws.xsd" key="gov:/services/eads_ws/eads_ws.xsd"/>
</publishWSDL>
<description></description>
</proxy>
I can successfully send a request to a RESTful service. However, my OUT sequence cannot handle the "application / rdf + xml" response. The logs show the following error:
INFO {org.apache.axis2.builder.BuilderUtil} - OMException in getSOAPBuilder {org.apache.axis2.builder.BuilderUtil}
org.apache.axiom.soap.SOAPProcessingException: First Element must contain the local name, Envelope , but found RDF
Two questions:
1. How can I log the actual response received from the REST service before Axis2 applies the SOAP transform to it? My log broker only generates an empty SOAP envelope.
INFO {org.apache.synapse.mediators.builtin.LogMediator} - To: http://www.w3.org/2005/08/addressing/anonymous, WSAction: , SOAPAction: , MessageID: urn:uuid:4c06fcb9-4e45-4fb3-bc5a-4350e3d86533, Direction: response, Envelope: <?xml version='1.0' encoding='utf-8'?><soapenv:Envelope xmlns:soapenv="http://www.w3.org/2003/05/soap-envelope"><soapenv:Body/></soapenv:Envelope> {org.apache.synapse.mediators.builtin.LogMediator}
2. How to convert from RDF + XML back to SOAP format? Do I have to use an XSLT mediator in the OUT sequence for this?
Appreciate your help!
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I wrote a simple Nodejs service that sends a message in RDF format. This is what it looks like when I call it using the Advanced Rest Client Chrome extension.
Then I created a proxy service in ESB 4.5.1. Here's my proxy service config,
<proxy xmlns="http://ws.apache.org/ns/synapse" name="TestProxy" transports="https,http" statistics="disable" trace="disable" startOnLoad="true">
<target>
<inSequence>
<log level="full"/>
<send>
<endpoint>
<address uri="http://localhost:8080/" format="pox"/>
</endpoint>
</send>
<log level="full"/>
<drop/>
</inSequence>
<outSequence>
<log level="full"/>
<send/>
</outSequence>
</target>
<description></description>
</proxy>
Then I used tryIt tool to send XML message to this proxy service. I am using a log broker to log an incoming XML message.
In the next sequence, I use the log broker again and I see that RDF is being logged there.
What version of ESB are you trying to use?
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