What is a 400 error code?

The HyperText Transfer Protocol (HTTP) 400 Bad Request response status code indicates that 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).

For More Information Please Refer: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/400