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Continue to ChatQuery : When to reply 400 Bad Request According to www.w3.org, a Web server should reply with status code 400 Bad Request if: "The request could not be understood by the server due to malformed https://vmapp.org/query/80637/When-To-Reply-400-Bad-Request-According-To-Www-W3-Org-A-Web-Server-Should-Reply-With-Status-Code-400-Bad-Request-If-The-Request-Could-Not-Be-Understood-By-The-Server-Due-To-Malformed/