Header Based Routing Sample

This sample demonstrates the routing capability of WSO2 Micro Integrator (WSO2 MI). In this scenario, routing occurs based on a header in the message. The integration involves a service that performs arithmetic operations. Depending on the value of the operation header in the message, it needs to be routed to the relevant service.

The routing decision is made based on the content of the HTTP header called Operation. Specifically, the Switch mediator extracts the value of the element using an XPath expression. Subsequently, the PayloadFactory mediator constructs the message payload required by the backend service.

Deploying the sample

1. Open the sample by clicking on the Header Based Routing card.
2. Give a folder location to save the sample.
3. Build and run the sample in your Micro Integrator.

Running the sample

1. Open a terminal and run the following commands to invoke the API.

   curl --location 'http://localhost:8290/calculate' \
   --header 'Operation: Add' \
   --header 'Content-Type: text/xml' \
   --data '<ArithmaticOperation>
       <Arg1>10</Arg1>
       <Arg2>25</Arg2>
   </ArithmaticOperation>'
   

   curl --location 'http://localhost:8290/calculate' \
   --header 'Operation: Divide' \
   --header 'Content-Type: text/xml' \
   --data '<ArithmaticOperation>
       <Arg1>10</Arg1>
       <Arg2>25</Arg2>
   </ArithmaticOperation>'
   

   You will receive the following responses.

   <?xml version="1.0" encoding="UTF-8" ?>
   <SOAP-ENV:Envelope xmlns:SOAP-ENV='http://schemas.xmlsoap.org/soap/envelope/' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:s='http://www.w3.org/2001/XMLSchema'>
       <SOAP-ENV:Body>
           <AddIntegerResponse xmlns="http://tempuri.org">
               <AddIntegerResult>35</AddIntegerResult>
           </AddIntegerResponse>
       </SOAP-ENV:Body>
   </SOAP-ENV:Envelope>
   

   <?xml version="1.0" encoding="UTF-8" ?>
   <SOAP-ENV:Envelope xmlns:SOAP-ENV='http://schemas.xmlsoap.org/soap/envelope/' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:s='http://www.w3.org/2001/XMLSchema'>
       <SOAP-ENV:Body>
           <DivideIntegerResponse xmlns="http://tempuri.org">
               <DivideIntegerResult>.4</DivideIntegerResult>
           </DivideIntegerResponse>
       </SOAP-ENV:Body>
   </SOAP-ENV:Envelope>
   

2. You can also run the unit test case defined for this sample.