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errors.fyi/http/428
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errors.fyi
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http
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428
http · http/428
428
Precondition Required
The origin server requires the request to be conditional, to prevent lost-update problems.
Also defined in
sip
Use Identity Header
The server requires the request to be signed with an Identity header to verify the identity of the caller, but no such header was present in the request.
References
rfc-editor.org/rfc/rfc6585
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Upgrade Required
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Too Many Requests
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