Revision 1096211 of 501 Not Implemented

<div>{{HTTPSidebar}}</div>

<p>The HTTP <code><strong>500</strong></code><strong><code> Not Implemented</code></strong> server error response code indicates that the request method is not supported by the server and cannot be handled. The only methods that servers are required to support (and therefore that must not return this code) are {{HTTPMethod("GET")}} and {{HTTPMethod("HEAD")}}.</p>

<p>Note: A 501 error is not something you can fix, but requires a fix by the web server you are trying to access.</p>

<p>A 501 response is cacheable by default.</p>

<h2 id="Status">Status</h2>

<pre class="syntaxbox">
501 Not Implemented</pre>

<h2 id="Specifications">Specifications</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Title</th>
  </tr>
  <tr>
   <td>{{RFC("7231", "501 Not Implemented" , "6.6.2")}}</td>
   <td>Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content</td>
  </tr>
 </tbody>
</table>

<h2 id="Browser_compatibility">Browser compatibility</h2>

<p class="hidden">The compatibility table in this page is generated from structured data. If you’d like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data/README.md">https://github.com/mdn/browser-compat-data/README.md</a> and send us a pull request.</p>

<p>{{Compat}}</p>