What does malformed request mean?

The 400 (Bad Request) 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). … The client SHOULD NOT repeat the request without modifications.

For More Information Please Refer: https://stackoverflow.com/questions/4781187/http-400-bad-request-for-logical-error-not-malformed-request-syntax