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Chapter 4. Global Valves
4.1. About Valves
A Valve is a Java class that gets inserted into the request processing pipeline for an application. It is inserted in the pipeline before servlet filters. Valves can make changes to the request before passing it on or perform any other processing such as authentication or even cancelling the request. Valves are usually packaged with an application.
Version 6.1.0 and later supports global valves.
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