WSO2 API manager - How to send Error/Fault message back to the Client from InSequence

Question

I have created a REST API using WSO2 API Manager (StockQuoteService) and configured a back end SOAP based web service (converting REST to SOAP) from where it will be getting the data based on the URL template.

In the "In Sequence", I have used a Switch mediator to send the request to different back end endpoints based on incoming data whereas in the default scenario (when no case match), I want to send the error message back to the client that the "Input message is invalid".

I have tried using the Send mediator, Respond Mediator, Sequence Mediator but still no success (may be doing something wrong) as still I am getting "no response from server" error when I try to invoke the URL which doesn't match any case of Switch and goes to Default.

How can I send the Error/Fault message back to the client from In Sequence of WSO2 API Manager?

alber arce alber arce · Accepted Answer · 2017-01-27T18:41:50

In my scenario, the input sequence I used the switch mediator and I invoke an operation or another, in the default option I create my failure response

  <inSequence>
     <switch xmlns:xsd="http://pharmacy.arce.org/xsd"
             description=""
             source="//xsd:desc">
        <case regex="NATURAL">
           <log description="Search Pharmacy" level="custom" separator=",">
              <property name="STATUS" value="Search Pharmacy"/>
           </log>
           <payloadFactory media-type="xml">
              <format>
                 <p:searchpharmacy xmlns:p="http://pharmacy.arce.org">
                    <ax22:pharmacy xmlns:ax22="http://pharmacy.arce.org">
                       <xs:desc xmlns:xs="http://pharmacy.arce.org/xsd">$1</xs:desc>
                       <xs:id xmlns:xs="http://pharmacy.arce.org/xsd">$2</xs:id>
                       <xs:latitude xmlns:xs="http://pharmacy.arce.org/xsd">$3</xs:latitude>
                       <xs:longitude xmlns:xs="http://pharmacy.arce.org/xsd">$4</xs:longitude>
                    </ax22:pharmacy>
                 </p:searchpharmacy>
              </format>
              <args>
                 <arg evaluator="xml" expression="//xsd:desc"/>
                 <arg evaluator="xml" expression="//xsd:id"/>
                 <arg evaluator="xml" expression="//xsd:latitude"/>
                 <arg evaluator="xml" expression="//xsd:longitude"/>
              </args>
           </payloadFactory>
           <header name="To" scope="default" value="urn:searchpharmacy"/>
           <log level="full" separator=",">
              <property name="Mensaje" value="Cuerpo"/>
           </log>
        </case>
        <case regex="EXPERIMENTAL">
           <log description="Search Pharmacy Direction" level="custom" separator=",">
              <property name="STATUS" value="Search Pharmacy Direction Request"/>
           </log>
           <payloadFactory media-type="xml">
              <format>
                 <p:searchPhone xmlns:p="http://pharmacy.arce.org">
                    <ax22:pharmacy xmlns:ax22="http://pharmacy.arce.org">
                       <xs:desc xmlns:xs="http://pharmacy.arce.org/xsd">$1</xs:desc>
                       <xs:id xmlns:xs="http://pharmacy.arce.org/xsd">$2</xs:id>
                       <xs:latitude xmlns:xs="http://pharmacy.arce.org/xsd">$3</xs:latitude>
                       <xs:longitude xmlns:xs="http://pharmacy.arce.org/xsd">$4</xs:longitude>
                    </ax22:pharmacy>
                 </p:searchPhone>
              </format>
              <args>
                 <arg evaluator="xml" expression="//xsd:desc"/>
                 <arg evaluator="xml" expression="//xsd:id"/>
                 <arg evaluator="xml" expression="//xsd:latitude"/>
                 <arg evaluator="xml" expression="//xsd:longitude"/>
              </args>
           </payloadFactory>
           <header name="Action" scope="default" value="urn:searchPhone"/>
           <property name="SOAPAction" scope="transport" type="STRING" value=""/>
           <log level="full" separator=",">
              <property name="Data" value="Body"/>
           </log>
        </case>
        <default>
           <log description="Fault" level="custom" separator=",">
              <property name="STATUS" value="Invoke fault "/>
           </log>
           <payloadFactory media-type="xml">
              <format>
                 <rs:fault xmlns:rs="http://pharmacy.arce.org">
                    <rs:code>-1</rs:code>
                    <rs:type>Invocation error</rs:type>
                    <rs:message>No operation has been invoked</rs:message>
                    <rs:description>The value of the input parameter is not valid</rs:description>
                 </rs:fault>
              </format>
              <args/>
           </payloadFactory>
           <respond/>
        </default>
     </switch>
  </inSequence>

Here is the default section

<default>
   <log description="Fault" level="custom" separator=",">
      <property name="STATUS" value="Invoke fault "/>
   </log>
   <payloadFactory media-type="xml">
      <format>
         <rs:fault xmlns:rs="http://pharmacy.arce.org">
            <rs:code>-1</rs:code>
            <rs:type>Invocation error</rs:type>
            <rs:message>No operation has been invoked</rs:message>
            <rs:description>The value of the input parameter is not valid</rs:description>
         </rs:fault>
      </format>
      <args/>
   </payloadFactory>
   <respond/>
</default>

And the fault response

  {"fault":{"code":-1,"type":"Invocation error","message":"No operation has been invoked","description":"The value of the input parameter is not valid"}}

You can find other scenarios here

http://harshcreationz.blogspot.com/2016/02/common-and-error-handling-sequences.html

WSO2 API manager - How to send Error/Fault message back to the Client from InSequence

3 Answers