Launch error 400

Hello,
I've been doing some flask and graphql practices. I made mutations, the proof of concept went well until I had to validate the data entry by the user.

Usually in api rest, I release a
`make_response(jsonify(error="my error"), 404) `
but with graphql I haven't found a way to launch a 400. All codes are 200.

Someone can explain to me a little more and how I could launch an error 400 when the user's input is not valid.

Thanks

未指定任何檔案、測試或進入點。先檢視此 Flask GraphQL 整合如何處理驗證錯誤與 HTTP 回應，接著將該行為與預期的 GraphQL 回應模型進行比較。當針對無效輸入及其 HTTP 狀態形成有文件記錄且已達成共識的方法時，即表示完成。

由索引模型根據 Issue 內容生成。