<h2>Description</h2>
<p>The HTTP <code>101 Switching Protocols</code> response code indicates
a protocol to which the server switches.
The protocol is specified in the <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Upgrade" rel="noopener" target="_blank">Upgrade</a> request header received from a client.</p>
<p>The server includes in this response an <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Upgrade" rel="noopener" target="_blank">Upgrade</a> response header to
indicate the protocol it switched to.</p>
<p>The process is described in the following article:
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Protocol_upgrade_mechanism" rel="noopener" target="_blank">Protocol upgrade mechanism</a></p>
<h3>See Also</h3>
<ul>
<li><a href="https://httpwg.org/specs/rfc9110.html#status.101" rel="noopener" target="_blank">Spec</a></li>
<li><a href="/en-US/docs/Web/HTTP/Headers/Upgrade">Upgrade</a>, the header that triggers the protocol switch</li>
<li><a href="/en-US/docs/Web/API/WebSockets_API">WebSockets</a>, a protocol which can be used with this status code</li>
<li><a href="https://http.cat/status/426" rel="noopener" target="_blank">426 Upgrade Required</a>, a status code that can be used to notify the client to switch to a different protocol</li>
</ul>
<p><strong>Source:</strong> <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/101" rel="noopener" target="_blank">https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/101</a></p>

1×× Informational

101 Switching Protocols

Description

See Also