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A caching filter optimizes the time it takes to send back a response from your web server, and a compression filter optimizes the size of the content that you send from your web server to a user via the Internet.previous

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Since generating content and sending content over the World Wide Web are the bread and butter of web applications, it should be no surprise that simple components that aid in these processes are incredibly useful. the process of building and using a caching filter and a compression filter that are suitable for use with just about any web application.
you will understand caching and compressing, have code to do both, and be able to apply caching and compression to any of your future web applications
Filters are designed to be able to manipulate a request or response that is sent to a web application, yet provide this functionality in a method that won\'t affect servlets and JSPs being used by the web application unless that is the desired effect. A good way to think of servlet filters is as a chain of steps that a request and response must go through before reaching a servlet, JSP, or static resource such as an HTML page in a web application
two filters will be presented that manipulate the HttpServletRequest and HttpServletResponse objects to provide some very convenient functionality.


 

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