index.md

---

title: 426 Upgrade Required
slug: Web/HTTP/Status/426
spec-urls: https://httpwg.org/specs/rfc9110.html#status.426

---

{{HTTPSidebar}}

The HTTP 426 Upgrade Required client error response code indicates that the server refuses to perform the request using the current protocol but might be willing to do so after the client upgrades to a different protocol.

The server sends an {{HTTPHeader("Upgrade")}} header with this response to indicate the required protocol(s).

Status

426 Upgrade Required

Examples

HTTP/1.1 426 Upgrade Required
Upgrade: HTTP/2.0
Connection: Upgrade
Content-Length: 53
Content-Type: text/plain

This service requires use of the HTTP/2.0 protocol

Specifications

{{Specifications}}

See also

• {{HTTPHeader("Upgrade")}}

• {{HTTPStatus("101")}} Switching Protocols