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+---
+title: 505 HTTP Version Not Supported
+slug: Web/HTTP/Status/505
+translation_of: Web/HTTP/Status/505
+---
+<div>{{HTTPSidebar}}</div>
+
+<p>The HyperText Transfer Protocol (HTTP) <code><strong>505 HTTP Version Not Supported</strong></code> response status code indicates that the HTTP version used in the request is not supported by the server.</p>
+
+<h2 id="Status">Status</h2>
+
+<pre class="syntaxbox">505 HTTP Version Not Supported</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", "505 HTTP Version Not Supported" , "6.6.6")}}</td>
+   <td>Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{HTTPHeader("Upgrade")}}</li>
+</ul>