httpstatuses/contents/codes/422.md

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set code title references
4 422 Unprocessable Entity
Rails HTTP Status Symbol
:unprocessable_entity

The 422 (Unprocessable Entity) status code means the server understands the content type of the request entity (hence a 415 (Unsupported Media Type) status code is inappropriate), and the syntax of the request entity is correct (thus a 400 (Bad Request) status code is inappropriate) but was unable to process the contained instructions. For example, this error condition may occur if an XML request body contains well-formed (i.e., syntactically correct), but semantically erroneous, XML instructions.

Source: RFC4918 Section 11.2