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Filters enable controllers to run shared pre- and post-processing code for
its actions. These filters can be used to do authentication, caching, or
auditing before the intended action is performed. Or to do localization or
output compression after the action has been performed. Filters have access
to the request, response, and all the instance variables set by other
filters in the chain or by the action (in the case of after filters).
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<code/>and<pre/>for code samples.