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170 lines
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<title>RFC 7231 - 404 Not Found</title>
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<span class="pre noprint docinfo top">[<a href="https://tools.ietf.org/html" title="Document search and retrieval page">Docs</a>] [<a href="https://tools.ietf.org/rfc/rfc7231.txt" title="Plaintext version of this document">txt</a>|<a href="https://tools.ietf.org/pdf/rfc7231" title="PDF version of this document">pdf</a>] [<a href="https://tools.ietf.org/html/draft-ietf-httpbis-p2-semantics" title="draft-ietf-httpbis-p2-semantics">draft-ietf-http...</a>] [<a href='https://datatracker.ietf.org/doc/rfc7231' title='IESG Datatracker information for this document'>Tracker</a>] [<a href="https://tools.ietf.org/rfcdiff?difftype=--hwdiff&url2=rfc7231" title="Inline diff (wdiff)">Diff1</a>] [<a href="https://tools.ietf.org/rfcdiff?url2=rfc7231" title="Side-by-side diff">Diff2</a>] [<a href="https://www.rfc-editor.org/errata_search.php?rfc=7231">Errata</a>]</span><br />
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<span class="pre noprint docinfo"> </span><br />
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<span class="pre noprint docinfo"> PROPOSED STANDARD</span><br />
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<span class="pre noprint docinfo"> <span style='color: #C00;'>Errata Exist</span></span><br />
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<pre>
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Internet Engineering Task Force (IETF) R. Fielding, Ed.
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Request for Comments: 7231 Adobe
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Obsoletes: <a href="https://tools.ietf.org/html/rfc2616">2616</a> J. Reschke, Ed.
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Updates: <a href="https://tools.ietf.org/html/rfc2817">2817</a> greenbytes
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Category: Standards Track June 2014
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ISSN: 2070-1721
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<span class="h1">Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content</span>
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Abstract
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The Hypertext Transfer Protocol (HTTP) is a stateless application-
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level protocol for distributed, collaborative, hypertext information
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systems. This document defines the semantics of HTTP/1.1 messages,
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as expressed by request methods, request header fields, response
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status codes, and response header fields, along with the payload of
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messages (metadata and body content) and mechanisms for content
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negotiation.
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<hr class='noprint' style='width: 96ex;' align='left'/><!--NewPage--><pre class='newpage'><a name="page-59" id="page-59" href="#page-59" class="invisible"> </a>
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<span class="grey"><a href="https://tools.ietf.org/html/rfc7231">RFC 7231</a> HTTP/1.1 Semantics and Content June 2014</span>
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<span class="h4"><a class="selflink" name="section-6.5.4" href="https://tools.ietf.org/html/rfc7231#section-6.5.4">6.5.4</a>. 404 Not Found</span>
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The 404 (Not Found) status code indicates that the origin server did
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not find a current representation for the target resource or is not
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willing to disclose that one exists. A 404 status code does not
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indicate whether this lack of representation is temporary or
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permanent; the 410 (Gone) status code is preferred over 404 if the
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origin server knows, presumably through some configurable means, that
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the condition is likely to be permanent.
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A 404 response is cacheable by default; i.e., unless otherwise
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indicated by the method definition or explicit cache controls (see
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<a href="https://tools.ietf.org/html/rfc7234#section-4.2.2">Section 4.2.2 of [RFC7234]</a>).
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<span class="grey">Fielding & Reschke Standards Track [Page 59]</span></pre>
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<hr class='noprint' style='width: 96ex;' align='left'/><!--NewPage--><pre class='newpage'><a name="page-60" id="page-60" href="#page-60" class="invisible"> </a>
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</pre>
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