Enabling two-phase rendering for a portlet

By default, two-phase rendering is turned off. To enable two-phase rendering for a portlet, you must update the portlet.xml deployment descriptor for the portlet.

1. Edit the portlet.xml file for the portlet.

   Add the following entry to the file:

   <portlet>
       ...
       <container-runtime-option>
           <name>javax.portlet.renderHeaders</name>
           <value>true</value>
       </container-runtime-option>
   </portlet>