Bad Request

Client Error

The server cannot process the request due to client error

Used for malformed requests, invalid JSON, missing required fields

How this status code appears in HTTP responses

HTTP Response Header

HTTP/1.1 400 Bad Request

cURL Example

curl -I https://example.com
# Returns: HTTP/1.1 400 Bad Request

This is a client error response indicating the request contains bad syntax or cannot be fulfilled.

Other codes in the same category

Authentication is required and has failed or has not been provided

Reserved for future use in digital payment systems

The server understood the request but refuses to authorize it