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----
-title: Forbidden header name
-slug: Glossary/Forbidden_header_name
-translation_of: Glossary/Forbidden_header_name
----
-<p>A <dfn>forbidden header name</dfn> is the name of any <a href="/en-US/docs/Web/HTTP/Headers">HTTP header</a> that cannot be modified programmatically; specifically, an HTTP <strong>request</strong> header name (in contrast with a {{Glossary("Forbidden response header name")}}).</p>
-
-<p>Modifying such headers is forbidden because the user agent retains full control over them. Names starting with `<code title="">Sec-</code>` are reserved for creating new headers safe from {{glossary("API","APIs")}} using <a href="/en-US/docs/Web/API/Fetch_API">Fetch</a> that grant developers control over headers, such as {{domxref("XMLHttpRequest")}}.</p>
-
-<p>Forbidden header names start with <code>Proxy-</code> or <code>Sec-</code>, or are one of the following names:</p>
-
-<ul class="brief">
- <li><code title="">Accept-Charset</code></li>
- <li><code title="">Accept-Encoding</code></li>
- <li><code title="">Access-Control-Request-Headers</code></li>
- <li><code title="">Access-Control-Request-Method</code></li>
- <li><code title="">Connection</code></li>
- <li><code title="">Content-Length</code></li>
- <li><code title="">Cookie</code></li>
- <li><code title="">Cookie2</code></li>
- <li><code title="">Date</code></li>
- <li><code title="">DNT</code></li>
- <li><code title="">Expect</code></li>
- <li><code title="">Feature-Policy</code></li>
- <li><code title="">Host</code></li>
- <li><code title="">Keep-Alive</code></li>
- <li><code title="http-origin">Origin</code></li>
- <li><code title="http-origin">Proxy-</code></li>
- <li><code title="http-origin">Sec-</code></li>
- <li><code title="">Referer</code></li>
- <li><code title="">TE</code></li>
- <li><code title="">Trailer</code></li>
- <li><code title="">Transfer-Encoding</code></li>
- <li><code title="">Upgrade</code></li>
- <li><code title="">Via</code></li>
-</ul>
-
-<div class="note">
-<p><strong>Note</strong>: The <code>User-Agent</code> header is no longer forbidden, <a href="https://fetch.spec.whatwg.org/#terminology-headers">as per spec</a> — see forbidden header name list (this was implemented in Firefox 43) — it can now be set in a Fetch <a href="/en-US/docs/Web/API/Headers">Headers</a> object, or via XHR <a href="/en-US/docs/Web/API/XMLHttpRequest#setRequestHeader%28%29">setRequestHeader()</a>.  However, Chrome will silently drop the header from Fetch requests (see <a href="https://bugs.chromium.org/p/chromium/issues/detail?id=571722">Chromium bug 571722</a>).</p>
-</div>
-
-<section class="Quick_links" id="Quick_Links">
-<ol>
- <li><a href="/en-US/docs/Glossary">MDN Web Docs Glossary</a>
-
-  <ol>
-   <li>{{Glossary("Forbidden response header name")}}</li>
-  </ol>
- </li>
-</ol>
-</section>