MDN Web Docs Glossary: Definitions of Web-related terms

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Idempotent: An HTTP method is idempotent if an identical request can be made once or several times in a row with the same effect while leaving the server in the same state. In other words, an idempotent method should not have any side-effects (except for keeping statistics). Implemented correctly, the GET, HEAD, PUT, and DELETE method are idempotent, but not the POST method. All safe methods are also idempotent.

Web technologies contain long lists of jargon and abbreviations that are used in documentation and coding. This glossary provides definitions of words and abbreviations you need to know to successfully understand and build for the web.

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MDN Web Docs Glossary: Definitions of Web-related terms

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