Using two-phase rendering with JSR 286 portlets

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.

Setting headers for a JSR 286 portlet
To set HTTP header information in your JSR 286 portlet, use the setProperty and addProperty methods of the PortletResponse.

Setting cookies for a JSR 286 portlet
Although cookies can be set like any other HTTP header, the portlet API provides the addProperty convenience method on the PortletResponse for setting cookies.

Modifying the HTML head section of a JSR 286 portlet
To write into the HTML head section of your JSR 286 portlet, for example, to change a page title, use the addProperty method on the PortletResponse.

Setting portlet caching values for a JSR 286 portlet
You can dynamically modify portlet caching parameters for a JSR 286 portlet during the render phase.