ASE blocks certain requests based on API Mapping or ABS detected attacks. For these blocked requests, it sends a standard error message back to the client.

The following table describes the error messages:

Blocked Connection HTTP Error Code Error Definition Message Body
Unknown API 503 Service Unavailable Error: Unknown API
Unknown Hostname 503 Service Unavailable Error: Unknown Hostname
Malformed Request 400 Bad Request Error: Malformed Request
IP attack 403 Unauthorized Error: Unauthorized
Cookie attack 403 Unauthorized Error: Unauthorized
OAuth2 Token attack 403 Unauthorized Error: Unauthorized
API Key attack 403 Unauthorized Error: Unauthorized
Username attack 403 Unauthorized Error: Unauthorized