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Cookies

Cookies are small bits of data that can be saved to the client's hard drive by a CGI program or a script. They are extraordinarily limited in scope and can contain only text - no binary code. They can only be accessed by the page which created them, cannot be more than 4k in size and a page can only create a single cookie. They are used to store custom disply informaton (for "MY Page" type functionality), keep persistant values across pages, keep simple stats for your visit, and are used in many "shopping cart" applications.

Cookies are a general mechanism which server side connections (such as CGI scripts) can use to both store and retrieve information on the client side of the connection. The addition of a simple, persistent, client-side state significantly extends the capabilities of Web-based client/server applications.

A server, when returning an HTTP object to a client, may also send a piece of state information which the client will store. Included in that state object is a description of the range of URLs for which that state is valid. Any future HTTP requests made by the client which fall in that range will include a transmittal of the current value of the state object from the client back to the server. The state object is called a cookie, for no compelling reason.

This simple mechanism provides a powerful new tool which enables a host of new types of applications to be written for web-based environments. Shopping applications can now store information about the currently selected items, for fee services can send back registration information and free the client from retyping a user-id on next connection, sites can store per-user preferences on the client, and have the client supply those preferences every time that site is connected to.

Cookies

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The cookie is nothing more than a text file assigned to unique visitors to your site.

Netscape: persistent Client State HTTP Cookies



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