upgradeRequired constant
HttpStatus
const upgradeRequired
426 UPGRADE REQUIRED.
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 MUST send an Upgrade header field in a 426 response to indicate the required protocol(s)
Example:
HTTP/1.1 426 Upgrade Required
Upgrade: HTTP/3.0
Connection: Upgrade
Content-Length: 53
Content-Type: text/plain
This service requires use of the HTTP/3.0 protocol.
Implementation
static const HttpStatus upgradeRequired = HttpStatus._(
code: HttpStatusCode.upgradeRequired,
name: 'Upgrade Required',
description:
'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.',
);