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<title>Nine Nines: HTTP status codes(7)</title>
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<h1 class="lined-header"><span>HTTP status codes(7)</span></h1>
<div class="sect1">
<h2 id="_name">Name</h2>
<div class="sectionbody">
<div class="paragraph"><p>HTTP status codes - status codes used by Cowboy</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">Description</h2>
<div class="sectionbody">
<div class="paragraph"><p>This chapter aims to list all HTTP status codes that Cowboy
may return, with details on the reasons why. The list given
here only includes the replies that Cowboy sends, not user
replies.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_100_continue">100 Continue</h2>
<div class="sectionbody">
<div class="paragraph"><p>When the client sends an <code>expect: 100-continue</code> header,
Cowboy automatically sends a this status code before
trying to read the request body. This behavior can be
disabled using the appropriate body option.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_101_switching_protocols">101 Switching Protocols</h2>
<div class="sectionbody">
<div class="paragraph"><p>This is the status code sent when switching to the
Websocket protocol.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_200_ok">200 OK</h2>
<div class="sectionbody">
<div class="paragraph"><p>This status code is sent by <code>cowboy_rest</code>.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_201_created">201 Created</h2>
<div class="sectionbody">
<div class="paragraph"><p>This status code is sent by <code>cowboy_rest</code>.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_202_accepted">202 Accepted</h2>
<div class="sectionbody">
<div class="paragraph"><p>This status code is sent by <code>cowboy_rest</code>.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_204_no_content">204 No Content</h2>
<div class="sectionbody">
<div class="paragraph"><p>This status code is sent when the processing of a request
ends without any reply having been sent. It may also be
sent by <code>cowboy_rest</code> under normal conditions.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_300_multiple_choices">300 Multiple Choices</h2>
<div class="sectionbody">
<div class="paragraph"><p>This status code is sent by <code>cowboy_rest</code>.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_301_moved_permanently">301 Moved Permanently</h2>
<div class="sectionbody">
<div class="paragraph"><p>This status code is sent by <code>cowboy_rest</code>.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_303_see_other">303 See Other</h2>
<div class="sectionbody">
<div class="paragraph"><p>This status code is sent by <code>cowboy_rest</code>.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_304_not_modified">304 Not Modified</h2>
<div class="sectionbody">
<div class="paragraph"><p>This status code is sent by <code>cowboy_rest</code>.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_307_temporary_redirect">307 Temporary Redirect</h2>
<div class="sectionbody">
<div class="paragraph"><p>This status code is sent by <code>cowboy_rest</code>.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_400_bad_request">400 Bad Request</h2>
<div class="sectionbody">
<div class="paragraph"><p>Cowboy will send this status code for any of the
following reasons:</p></div>
<div class="ulist"><ul>
<li>
<p>
Too many empty lines were sent before the request.
</p>
</li>
<li>
<p>
The request-line could not be parsed.
</p>
</li>
<li>
<p>
Too many headers were sent.
</p>
</li>
<li>
<p>
A header name was too long.
</p>
</li>
<li>
<p>
A header value was too long.
</p>
</li>
<li>
<p>
The host header was missing from an HTTP/1.1 request.
</p>
</li>
<li>
<p>
The host header could not be parsed.
</p>
</li>
<li>
<p>
The requested host was not found.
</p>
</li>
<li>
<p>
The requested path could not be parsed.
</p>
</li>
<li>
<p>
The accept header could not be parsed when using REST.
</p>
</li>
<li>
<p>
REST under normal conditions.
</p>
</li>
<li>
<p>
A Websocket upgrade failed.
</p>
</li>
</ul></div>
</div>
</div>
<div class="sect1">
<h2 id="_401_unauthorized">401 Unauthorized</h2>
<div class="sectionbody">
<div class="paragraph"><p>This status code is sent by <code>cowboy_rest</code>.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_403_forbidden">403 Forbidden</h2>
<div class="sectionbody">
<div class="paragraph"><p>This status code is sent by <code>cowboy_rest</code>.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_404_not_found">404 Not Found</h2>
<div class="sectionbody">
<div class="paragraph"><p>This status code is sent when the router successfully
resolved the host but didn’t find a matching path for
the request. It may also be sent by <code>cowboy_rest</code> under
normal conditions.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_405_method_not_allowed">405 Method Not Allowed</h2>
<div class="sectionbody">
<div class="paragraph"><p>This status code is sent by <code>cowboy_rest</code>.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_406_not_acceptable">406 Not Acceptable</h2>
<div class="sectionbody">
<div class="paragraph"><p>This status code is sent by <code>cowboy_rest</code>.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_408_request_timeout">408 Request Timeout</h2>
<div class="sectionbody">
<div class="paragraph"><p>Cowboy will send this status code to the client if the
client started to send a request, indicated by the
request-line being received fully, but failed to send
all headers in a reasonable time.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_409_conflict">409 Conflict</h2>
<div class="sectionbody">
<div class="paragraph"><p>This status code is sent by <code>cowboy_rest</code>.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_410_gone">410 Gone</h2>
<div class="sectionbody">
<div class="paragraph"><p>This status code is sent by <code>cowboy_rest</code>.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_412_precondition_failed">412 Precondition Failed</h2>
<div class="sectionbody">
<div class="paragraph"><p>This status code is sent by <code>cowboy_rest</code>.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_413_request_entity_too_large">413 Request Entity Too Large</h2>
<div class="sectionbody">
<div class="paragraph"><p>This status code is sent by <code>cowboy_rest</code>.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_414_request_uri_too_long">414 Request-URI Too Long</h2>
<div class="sectionbody">
<div class="paragraph"><p>Cowboy will send this status code to the client if the
request-line is too long. It may also be sent by
<code>cowboy_rest</code> under normal conditions.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_415_unsupported_media_type">415 Unsupported Media Type</h2>
<div class="sectionbody">
<div class="paragraph"><p>This status code is sent by <code>cowboy_rest</code>.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_500_internal_server_error">500 Internal Server Error</h2>
<div class="sectionbody">
<div class="paragraph"><p>This status code is sent when a crash occurs in HTTP, loop
or REST handlers, or when an invalid return value is
returned. It may also be sent by <code>cowboy_rest</code> under
normal conditions.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_501_not_implemented">501 Not Implemented</h2>
<div class="sectionbody">
<div class="paragraph"><p>This status code is sent by <code>cowboy_rest</code>.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_503_service_unavailable">503 Service Unavailable</h2>
<div class="sectionbody">
<div class="paragraph"><p>This status code is sent by <code>cowboy_rest</code>.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_505_http_version_not_supported">505 HTTP Version Not Supported</h2>
<div class="sectionbody">
<div class="paragraph"><p>Cowboy only supports the versions 1.0 and 1.1 of HTTP.
In all other cases this status code is sent back to the
client and the connection is closed.</p></div>
</div>
</div>
</div>
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