2015-11-06 22:55:41 +01:00
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---
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set: 4
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code: 426
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title: Upgrade Required
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2015-11-07 05:34:40 +01:00
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references:
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"Rails HTTP Status Symbol": ":upgrade_required"
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2015-11-06 22:55:41 +01:00
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---
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2015-11-07 06:45:46 +01:00
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The 426 Upgrade Required status code indicates that the server refuses to
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2015-11-07 05:34:40 +01:00
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perform the request using the current protocol but might be willing to do so
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2015-11-07 06:45:46 +01:00
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after the client upgrades to a different protocol.
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The server MUST send an Upgrade header field in a 426 response to indicate the
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required protocol(s) (Section 6.7 of RFC7230][2]).
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2015-11-07 05:34:40 +01:00
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Example:
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```
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HTTP/1.1 426 Upgrade Required
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Upgrade: HTTP/3.0
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Connection: Upgrade
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Content-Length: 53
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Content-Type: text/plain
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This service requires use of the HTTP/3.0 protocol.
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```
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Source: [RFC7231 Section 6.5.15][1]
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[1]: <http://tools.ietf.org/html/rfc7231#section-6.5.15>
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[2]: <http://tools.ietf.org/html/rfc7230#section-6.7>
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