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JAVA SERVLET

Cookies are a way for a server (or a servlet, as part of a server) to send some information to a client to store, and for the server to later retrieve its data from that client. Servlets send cookies to clients by adding fields to HTTP response headers. Clients automatically return cookies by adding fields to HTTP request headers.

A server can provide one or more cookies to a client. Client software, such as a web browser, is expected to support twenty cookies per host, of at least four kilobytes each.