How to add HTTP Basic Authentication header to the outgoing message of WSO2 ESB Proxy service

Here I am going to discuss how to access the web service secured by HTTP Basic Authentication via a proxy service deployed on WSO2 ESB.

The scenario is client invoke the proxy service without the Authorization header and WSO2 ESB proxy service add  the Authorization to out going message and call the actual backend service.

Here You need to set authorization header to HTTP request sent bu the ESB. You can achieve this by using property mediator  with the propert name Authorization.

<property xmlns:ns="http://org.apache.synapse/xsd"  
           name="Authorization"  
           expression="fn:concat('Basic ', base64Encode('username:password'))"  
           scope="transport"/>

Below is the header you need to send with the request.

authorization:Basic dXNlcm5hbWU6cGFzc3dvcmQ=


You can set this header within the proxy service by configuring property mediator as below.

<proxy xmlns="http://ws.apache.org/ns/synapse"  
     name="stockQuote"  
     transports="https,http"  
     statistics="disable"  
     trace="disable"  
     startOnLoad="true">  
   <target>  
    <inSequence>  
      <property name="symbol1" value="2" scope="default" type="STRING"/>  
      <property xmlns:ns="http://org.apache.synapse/xsd"  
           name="Authorization"  
           expression="fn:concat('Basic ', base64Encode('username:password'))"  
           scope="transport"/>  
      <send>  
       <endpoint>  
         <address uri="http://localhost:8080/echo/echoheaders"/>  
       </endpoint>  
      </send>  
    </inSequence>  
   </target>  
   <description/>  
 </proxy>

Then the outgoing request from the ESB will contains the authorization header and backend service can be accessed.