WSO2 ESB REST API - Dynamic HTTP EndPoint (using T

Question

I want to externalize the hostname and port number in HTTP endpoint, so I am trying to pass the hostname and port number in JVM argument while starting the ESB. Using script/class mediator, I can get it from system properties and put it in message context. Then using property mediator, I can access and log the value of it. Till this point, I don't have any issue but when I try to use this value to replace in the HTTP endpoint as below; it doesn't work.

Actual ESB Synapse API Config:

---

 <api xmlns="http://ws.apache.org/ns/synapse" name="ContentLength" context="/content">
    <resource methods="GET">
       <inSequence>
          <send>
             <endpoint>
               <http method="get" uri-template="http://198.160.1.223:8080/greeting/{uri.var.name}"></http>
             </endpoint>
          </send>
       </inSequence>
       <outSequence>
          <send></send>
       </outSequence>
   </resource>
 </api>

Expected ESB Synapse API Config:

---

  <api xmlns="http://ws.apache.org/ns/synapse" name="ContentLength" context="/content">
     <resource methods="GET">
        <inSequence>
            <script language="js">mc.setProperty("system.hostname",java.lang.System.getProperty("my.hostname"));mc.setProperty("system.port.no",java.lang.System.getProperty("my.port.no"));</script>
        <log level="custom">
           <property name="system.hostname" expression="get-property('system.hostname')"/>
           <property name="system.port.no" expression="get-property('system.port.no')"/>
        </log>
            <send>
              <endpoint>
                <http method="get" uri-template="http://{system.prop.my.hostname}:{system.prop.my.port.no}/greeting/{uri.var.name}"></http>
              </endpoint>
           </send>
        </inSequence>
        <outSequence>
           <send></send>
        </outSequence>
    </resource>
  </api>

Is there any way I can use Template Endpoint and HTTP endpoint in this scenario ?

Let me know alternative options as well.

Answer 1

Since you have asked for alternative options you can do string concatenation at the property mediator for hostname and port and then directly use it in the uri-template.

Please refer this link to get an idea about http endpoints.

Answer 2

<property name="uri.var.host" expression="get-property('system.hostname')"/>
       <property name="uri.var.port" expression="get-property('system.port.no')"/>
    </log>
        <send>
          <endpoint>
            <http method="get" uri-template="http://{uri.var.host}:{uri.var.port}/greeting/{uri.var.name}"></http>
          </endpoint>
       </send>

Change as above. It will work.