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Stateless Architecture



Stateless means there is no record of previous interactions and each interaction request has to be handled based entirely on information that comes with it.

In computing, a stateless protocol is a communications protocol that treats each request as an independent transaction that is unrelated to any previous request so that the communication consists of independent pairs of requests and responses. A stateless protocol does not require the server to retain session information or status about each communications partner for the duration of multiple requests.

The Internet's basic protocol, the Internet Protocol ( IP ), is an example of a stateless interaction. Each packet travels entirely on its own without reference to any other packet. When you request a Web page from a Web site, the request travels in one or more packets, each independent of the other as far as the Internet Protocol program itself is concerned. (The upper layer Transmission Control Protocol - TCP - does relate packets to each other, but uses the information within the packet rather than some external information to do this.)

A stateless service is one that provides a response after your request, and then requires no further attention. To make a stateless service highly available, you need to provide redundant instances and load balance them.

A stateful service is one where subsequent requests to the service depend on the results of the first request.

HTTP is a stateless protocol, which means that the connection between the browser and the server is lost once the transaction ends.
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