426 Upgrade Required
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 Upgrade
header with this response to indicate the
required protocol(s).
Status
http
426 Upgrade Required
Examples
http
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
Specification |
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Unknown specification # status.426 |