4×× 客户端错误

400 Bad Request 错误请求

由于被视为客户端错误（例如，格式错误的请求语法，无效的请求消息成帧或欺骗性请求路由），服务器无法或不会处理请求。

• Source: RFC7231 Section 6.5.1

400 代码参考

Rails HTTP Status Symbol bad_request

Go HTTP Status Constant http.StatusBadRequest

Symfony HTTP Status Constant Response::HTTP_BAD_REQUEST

Python2 HTTP Status Constant httplib.BAD_REQUEST

Python3+ HTTP Status Constant http.client.BAD_REQUEST

Python3.5+ HTTP Status Constant http.HTTPStatus.BAD_REQUEST