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The HyperText Transfer Protocol (HTTP) 422 Unprocessable Entity response status code indicates that the server understands the content type of the request entity, and the syntax of the request entity is correct, but it was unable to process the contained instructions.
HTTP 422 返回码 表示服务器理解请求实体的content type,并且请求实体的语法是正确的，但是服务器不能处理所包含的指示.
Important: The client should not repeat this request without modification.
Status
422 Unprocessable Entity
Specifications
| Specification | Title |
|---|---|
| RFC 4918, section 11.2: 422 Unprocessable Entity | HTTP Extensions for Web Distributed Authoring and Versioning (WebDAV) |