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TCP/IP Guide by Charles M. Kozierok

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HTTP State Management Using Cookies

Even though modern HTTP has a lot of capabilities and features, it is still, at its heart, a simple request/reply protocol. One of the unfortunate problems that results from this is that HTTP is entirely stateless. This means that each time a server receives a request from a client, it processes the request, sends a response, and then forgets about the request. The next request from the client is treated as independent of any previous ones.

Note

The persistent connection feature of HTTP/1.1 (described in Chapter 80) does not change the stateless nature of the protocol. Even though multiple requests and responses can be sent on a single Transmission Control Protocol (TCP) connection, they are still not treated ...

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