Since hooks are the preferred plugin type for customizing Liferay’s core features, the Liferay team is happy to keep providing you new hooks. This section is a placeholder for hooks that are available in Liferay Portal 6.1, but aren’t yet fully documented.
Servlet filter hook: Servlet filters allow you to pre-process requests going to a servlet and post-process responses coming from a servlet. As server requests are received that match URL patterns or match servlet names specified in your servlet filter mappings, your specified servlet filters are applied. Hook elements servlet-filter and servlet-filter-mapping have been added to liferay-hook.xml so you can configure your servlet filters. For a working example, see the sample-servlet-filter-hook in the Plugin SDK.