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Reserve 418 status code #149

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@@ -6298,6 +6298,11 @@ Expect: 100-continue
<c>
<xref target="status.417"/>
</c>
<c>418</c>
<c>(Unused)</c>
<c>
<xref target="status.418"/>
</c>
<c>422</c>
<c>Unprocessable Entity</c>
<c>
@@ -7464,6 +7469,24 @@ Content-Range: bytes */47022
</t>
</section>

<section title="418 (Unused)" anchor="status.418">
<iref primary="true" item="418 (Unused) (status code)" x:for-anchor=""/>
<x:anchor-alias value="418 (Unused)"/>
<t>
<xref target="RFC2324"/> was an April 1 RFC that lampooned the various
ways HTTP was abused; one such abuse was the definition of an
application-specific 418 status code. In the intervening years, this
status code has been widely implemented as an "Easter Egg", and therefore
is effectively consumed by this use.
</t>
<t>
Therefore, the 418 status code is reserved in the IANA HTTP Status Code
registry. This indicates that the status code cannot be assigned to other
applications currently. If future circumstances require its use (e.g.,
exhaustion of 4NN status codes), it can be re-assigned to another use.
</t>
</section>

<section title="422 Unprocessable Entity" anchor="status.422">
<iref primary="true" item="422 Unprocessable Entity (status code)" x:for-anchor=""/>
<x:anchor-alias value="422 (Unprocessable Entity)"/>
@@ -9493,6 +9516,18 @@ Content-Encoding: gzip
status code values summarized in the table of
<xref target="overview.of.status.codes"/>.
</t>
<t>
Additionally, please update the following entry in the Hypertext Transfer
Protocol (HTTP) Status Code Registry:
</t>
<dl>
<dt>Value:</dt>
<dd>418</dd>
<dt>Description:</dt>
<dd>(Unused)</dd>
<dt>Reference</dt>
<dd><xref target="status.418"/></dd>
</dl>
</section>

<section title="Header Field Registration" anchor="header.field.registration">
@@ -10017,6 +10052,15 @@ Content-Encoding: gzip
<seriesInfo name='RFC' value='2295'/>
</reference>

<reference anchor="RFC2324">
<front>
<title>Hyper Text Coffee Pot Control Protocol (HTCPCP/1.0)</title>
<author initials="L." surname="Masinter" fullname="L. Masinter"/>
<date year="1998" month="April"/>
</front>
<seriesInfo name="RFC" value="2324"/>
</reference>

<reference anchor="RFC2557">
<front>
<title abbrev="MIME Encapsulation of Aggregate Documents">MIME Encapsulation of Aggregate Documents, such as HTML (MHTML)</title>
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