Malformed Response - Invoking one ESB REST service from another - rest

Question

I am relatively new to WSO2 ESB,
Trying to invoke a REST Web service with GET parameter which is hosted on WSO2 ESB through another REST API.
This is a simple Web service(SampleREST) which replies with welcome messsage in XML format,
When i am invoking this service directly; i can see the correct response on browser, shown below
<Message xmlns="http://ws.apache.org/ns/synapse">WelcomeRanjan</Message>
Now i created another REST web service(InvokeSampleRest) which in turn invokes SampleREST web service with the parametrized GET,
the Invoke WebService Client returns me the XML response wrapped inside the mediator xml tag and other malformed tags, shown below
<mediate><<Message xmlns>"http://ws.apache.org/ns/synapse">WelcomeRanjan</Message></<Message xmlns></mediate>
Here is my Code for the SampleREST API
<?xml version="1.0" encoding="UTF-8"?>
<api xmlns="http://ws.apache.org/ns/synapse" name="SampleREST" context="/SampleRest" hostname="10.203.245.47">
<resource methods="GET" uri-template="/{str1}">
<inSequence>
<header name="To" action="remove"/>
<property name="RESPONSE" value="true" scope="default" type="STRING"/>
<property name="NO_ENTITY_BODY" scope="axis2" action="remove"/>
<payloadFactory>
<format>
<Message>$1</Message>
</format>
<args>
<arg expression="get-property('uri.var.str1')"/>
</args>
</payloadFactory>
<log level="full" separator=",">
<property name="sequence" value="*** Got Request ***"/>
</log>
<send/>
</inSequence>
<outSequence/>
<faultSequence/>
</resource>
</api>
The code for the InvokeSampleREST code is as shown below( i am calling SampleREST service from here )
<?xml version="1.0" encoding="UTF-8"?>
<api xmlns="http://ws.apache.org/ns/synapse" name="InvokeSampleREST" context="/InvokeSampleREST" hostname="10.203.245.47">
<resource methods="GET" uri-template="/{str1}">
<inSequence>
<log level="full" separator=","/>
<property name="REST_URL_POSTFIX" expression="fn:concat('/Welcome',get-property('uri.var.str1'))" scope="axis2" type="STRING"/>
<log level="full">
<property name="sequence" value="****Message Sent *** "/>
</log>
<send>
<endpoint>
<address uri="http://10.203.245.47:8280/SampleRest/"/>
</endpoint>
</send>
</inSequence>
<outSequence>
<log level="full" separator=",">
<property name="out" value="** Ouput of Rest call ***"/>
</log>
<property name="ContentType" value="application/xml" scope="axis2" type="STRING"/>
<send/>
</outSequence>
<faultSequence/>
</resource>
</api>
Appreciate any help.
Thanks,
Ranjan

Answer 1

Why are you using two APIs? You can design your flow, in a single API. I mean you can merge them together.
BTW, you need to set the contentType property in your backend API(ie:At SampleREST API)
Because, when you send back the response to "InvokeSampleREST" API, System doesnt know the content-type of the incoming response and try to handle it as text message.
Eg:
<api name="SampleREST" context="/SampleRest" hostname="localhost">
<resource methods="GET" uri-template="/{str1}">
<inSequence>
<header name="To" action="remove"/>
<property name="NO_ENTITY_BODY" scope="axis2" action="remove"/>
<property name="RESPONSE" value="true" scope="default" type="STRING"/>
<payloadFactory>
<format>
<Message>$1</Message>
</format>
<args>
<arg expression="get-property('uri.var.str1')"/>
</args>
</payloadFactory>
<log level="full" separator=",">
<property name="sequence" value="*** Got Request ***"/>
</log>
<property name="Content-Type"
value="application/xml"
scope="transport"
type="STRING"/>
<send/>
</inSequence>
<faultSequence/>
</resource>

Answer 2

Try doing the following change at the InvokeSampleREST API.
At the outSequence, set the messageType as follows before the <send> mediator.
<property name="messageType" value="application/xml" scope="axis2"/>