A filter is a Java class that is called to process client requests or the server's response. Filters can be used to modify the request header or the content of a servlet request or response.
Filters can be mapped to a URL or a servlet name. When a filter is mapped to a URL (path-mapped), the filter applies to every servlet and JavaServer Page (JSP) in the Web application. When a filter is mapped to a servlet name (servlet-mapped), it applies to a single servlet or JSP. Path-mapped filters are executed first, followed by servlet-mapped filters.
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