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  • Eihab Hala thinks this is interesting:

All forty standard error codes are defined and categorized in RFC 2616, available at www.w3.org/Protocols/rfc2616/rfc2616-sec10.html. Some of them are obscure, but it pays to know them. For instance, the 204 response code, "No Content," can be used in a web application to take action when the user clicks a link, without making the user's web browser load another page.