400 Bad Request

The HTTP 400 status code means a server doesn’t want to process a request because of a client error.

It’s a generic, catch-all status code that’s best used when there aren’t more descriptive status codes available.

Common causes of 400 Bad Request errors:

• malformed request body (payload)
• bad/malformed URL
• large request body, headers, or cookies (413 and 431 status codes would be more appropriate in those cases)
• invalid or expired cookie