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HTTP Status Dragons

428
Precondition Required

428 Precondition Required

Image Link

https://httpdragons.com/428.png

JSON Link

https://httpdragons.com/428.json

Image Author

Spiritpaw73

Description

The origin server requires the request to be conditional. This response is intended to prevent the 'lost update' problem, where a client GETs a resource's state, modifies it and PUTs it back to the server, when meanwhile a third party has modified the state on the server, leading to a conflict.
More info
< 426 Upgrade Required
429 Too Many Requests >