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798 B
set | code | title | references | ||
---|---|---|---|---|---|
4 | 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)1
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.
- 1 Upgrade RFC7230 Section 6.7
- Source: RFC7231 Section 6.5.15