4×× Client Error

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

.NET HTTP Status Enum HttpStatusCode.BadRequest

Rust HTTP Status Constant http::StatusCode::BAD_REQUEST

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