422 unprocessable entity原因關於「HTTP status code 422 vs 400」標籤，搜尋引擎有相關的訊息討論：
HTTP Status Codes For Invalid Data: 400 vs. 422 - Ben Nadelwww.bennadel.com › blog › 2434-http-status-codes-for-in...HTTP status code 400 vs 422 · Issue #180 - GitHubgithub.com › marshmallow-code › webargs › issues422 Unprocessable Entity - HTTP - MDN Web Docsdeveloper.mozilla.