RFC 2616 describes the 4xx error codes as “Client Error - The request contains bad syntax or cannot be fulfilled.”<p>In other words, the error has to do with the client’s <i>request</i> but it&#x27;s not necessarily the client’s <i>fault.</i>  For a similar example see the response code “410 Gone”:<p><a href="http:&#x2F;&#x2F;www.w3.org&#x2F;Protocols&#x2F;rfc2616&#x2F;rfc2616-sec10.html#sec10.4.11" rel="nofollow">http:&#x2F;&#x2F;www.w3.org&#x2F;Protocols&#x2F;rfc2616&#x2F;rfc2616-sec10.html#sec10...</a>