title: How to add query params to URL in API in WSO2 ESB
body: <p>I need to append query params to endpoint URI according to query params in  request.</p>
  
  <p>I have an resource API in ESB published like this:</p>
  
  <pre><code>&lt;resource methods="GET" url-mapping="/searchEngine/sortAndFilterVolunteers*"&gt;
    &lt;inSequence&gt;
       &lt;send&gt;
          &lt;endpoint&gt;
             &lt;address
                  uri="http://localhost:8080/project-web-services/services/project-rs"&gt;&lt;/address&gt;
          &lt;/endpoint&gt;
       &lt;/send&gt;
    &lt;/inSequence&gt;
  </code></pre>
  
  <p></p>
  
  <p>I have to append query params dinamically.</p>
  
  <p>How could I do that?</p>