Filters

Filters have its own API. The javax.servlet package contains the three interfaces of Filter API.

Filters can perform many different types of functions.:

Authentication-Blocking requests based on user identity.
Logging and auditing-Tracking users of a web application.
Image conversion-Scaling maps, and so on.
Data compression-Making downloads smaller.
Localization-Targeting the request and response to a particular locale.
XSL/T transformations of XML content-Targeting web application responses to more that one type of client.

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