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---
title: 401 Yetkisiz
slug: Web/HTTP/Status/401
translation_of: Web/HTTP/Status/401
---
<div>{{HTTPSidebar}}</div>
<p>The HTTP <strong><code>401 Unauthorized</code></strong> client error status response code indicates that the request has not been applied because it lacks valid authentication credentials for the target resource.</p>
<p>This status is sent with a {{HTTPHeader("WWW-Authenticate")}} header that contains information on how to authorize correctly.</p>
<p>This status is similar to {{HTTPStatus("403")}}, but in this case, authentication is possible.</p>
<h2 id="Status">Status</h2>
<pre class="syntaxbox notranslate">401 Unauthorized</pre>
<h2 id="Example_response">Example response</h2>
<pre class="notranslate">HTTP/1.1 401 Unauthorized
Date: Wed, 21 Oct 2015 07:28:00 GMT
WWW-Authenticate: Basic realm="Access to staging site"</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("7235", "401 Unauthorized" , "3.1")}}</td>
<td>HTTP/1.1: Authentication</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">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
<p>{{Compat("http.status.401")}}</p>
<h2 id="See_also">See also</h2>
<ul>
<li><a href="/en-US/docs/Web/HTTP/Authentication">HTTP authentication</a></li>
<li>{{HTTPHeader("WWW-Authenticate")}}</li>
<li>{{HTTPHeader("Authorization")}}</li>
<li>{{HTTPHeader("Proxy-Authorization")}}</li>
<li>{{HTTPHeader("Proxy-Authenticate")}}</li>
<li>{{HTTPStatus("403")}}, {{HTTPStatus("407")}}</li>
</ul>
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