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{{Short description|Communications protocol in which no information is retained by either sender or receiver}}
A '''stateless protocol''' is a [[communication protocol]] in which the receiver must not retain [[Session (computer science)|session]] state from previous requests. The sender transfers relevant session state to the receiver in such a way that every request can be understood in isolation, that is without [[reference]] to session state from previous requests retained by the receiver.<ref>{{cite thesis |last=Fielding |first=Roy |date=2000 |title=Architectural Styles and the Design of Network-Based Software Architectures |type=Doctoral dissertation |publisher=University of California, Irvine |oclc=45706361 |url=https://www.ics.uci.edu/~fielding/pubs/dissertation/top.htm |section-url=https://www.ics.uci.edu/~fielding/pubs/dissertation/net_arch_styles.htm#sec_3_4_3 |section=3.4.3 Client-Stateless-Server (CSS) |access-date=2021-05-18}}</ref>
In contrast, a '''stateful protocol''' is a communication protocol in which the receiver may retain session state from previous requests.
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