When you work on portlets there are certain
challenges when it comes to setting up cookies, http headers or changing the
page title dynamically. IBM WebSphere Portal with JSR-286 portlets can solve
this problem by enabling Two-Phase Rendering.
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.
Add the following entry to the file:
<portlet>
...
<container-runtime-option>
<name>javax.portlet.renderHeaders</name>
<value>true</value>
</container-runtime-option>
</portlet>
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