Revision 1128889 of Origin

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

<p>The <strong><code>Origin</code></strong> request header specifies indicates where a fetch originates from. It doesn't include any path information, but only the server name. It is sent in requests where a {{Glossary("CORS")}} flag is set as well as in {{HTTPMethod("POST")}} requests.</p>

<table class="properties">
 <tbody>
  <tr>
   <th scope="row">Header type</th>
   <td>{{Glossary("Request header")}}</td>
  </tr>
  <tr>
   <th scope="row">{{Glossary("Forbidden header name")}}</th>
   <td>yes</td>
  </tr>
 </tbody>
</table>

<h2 id="Syntax">Syntax</h2>

<pre class="syntaxbox">
Origin: ""
Origin: &lt;scheme&gt; "://" &lt;host&gt; [ ":" &lt;port&gt; ]
</pre>

<p><code>Origin</code> can be the empty string; this is useful, for example, if the source is a <code>data</code> URL.</p>

<h2 id="Directives">Directives</h2>

<dl>
 <dt>&lt;scheme&gt;</dt>
 <dd>The protocol that is used. Usually it is the HTTP protocol or its secured version, HTTPS.</dd>
 <dt>&lt;host&gt;</dt>
 <dd>The domain name of the server (for virtual hosting) or the IP.</dd>
 <dt>&lt;port&gt; {{optional_inline}}</dt>
 <dd>TCP port number on which the server is listening. If no port is given, the default port for the service requested (e.g., "80" for an HTTP URL) is implied.</dd>
</dl>

<h2 id="Examples">Examples</h2>

<pre>
Origin: https://developer.mozilla.org</pre>

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

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Comment</th>
  </tr>
  <tr>
   <td>{{RFC("6454", "Origin", "7")}}</td>
   <td>The Web Origin Concept</td>
  </tr>
  <tr>
   <td>{{SpecName('Fetch','#origin-header','Origin header')}}</td>
   <td>Supplants the <code>Origin</code> header as defined in RFC6454.</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}}</p>

<h2 id="See_also">See also</h2>

<ul>
 <li>{{HTTPHeader("Host")}}</li>
 <li>{{HTTPHeader("Referer")}}</li>
 <li><a href="/en-US/docs/Web/Security/Same-origin_policy">Same-origin policy</a></li>
</ul>