400 Bad Request

The server cannot or will not process the request due to something that is perceived to be a client error (e.g., malformed request syntax, invalid request message framing, or deceptive request routing).

Source: RFC7231 Section 6.5.1

400 Code references

Go HTTP Status Constant http.StatusBadRequest
Python3+ HTTP Status Constant http.client.BAD_REQUEST
Python3.5+ HTTP Status Constant http.HTTPStatus.BAD_REQUEST
Rails HTTP Status Symbol :bad_request
Symfony HTTP Status Constant Response::HTTP_BAD_REQUEST

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