How to register vSphere web client pulg-in using API

Hi All

        I am new to web client pulg-in development. I have tried to register the web client pulg-in using vim25 sdk. registerExtension Method executed but package not deployed from server.

If manually copied the folder and xml its working fine. Is it stand way to register the pulgin.

XML Detail:

<extension>

   <description>

      <label>Hello World</label>

      <summary>vSphere web client </summary>

   </description>

   <key>com.purestorage</key>

   <company>Hello World</company>

   <version>1.1.4</version>

   <client>

      <version>1.1.4</version>

      <description>

         <label>Hello World</label>

         <summary> vSphere web client</summary>

      </description>

      <company>Hello World</company>

      <type>vsphere-client-serenity</type>

      <url>http://172.30.42.204:8400/helloworld.zip</url>

   </client>

     <server>

      <version>1.1.4</version>

      <description>

         <label>Hello World</label>

         <summary>web CLient</summary>

      </description>

      <company>Hello World</company>

      <type>vsphere-client-serenity</type>

      <url>http://172.30.42.204:8400/helloworld.zip</url> (Tomcat server running in 172.30.42.204

   </server>

   <iconSmaller>

  http://www.vmware.com/support/developer/vc-sdk/visdk25pubs/docresources/page.gif

  </iconSmaller>

   <lastHeartbeatTime></lastHeartbeatTime>

</extension>