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4xx Client errors
Last updated Sep 22, 2021

426 - Upgrade Required

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The HTTP Status Code 426 means that the client should switch to a different protocol such as TLS/1.0, as given in the Upgrade header field.‍

Additional Links and Codes Related to Status Code 426

308
Permanent Redirect
403
Forbidden
423
Locked
405
Method Not Allowed
431
Request Header Fields Too Large
424
Failed Dependency
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