HTTP Return Codes

• HTTP 4XX return codes are used for malformed requests; the issue is on the sender's side.

• HTTP 403 return code is used when the WAF Limit (Web Application Firewall) has been violated.

• HTTP 409 return code is used when a cancelReplace order partially succeeds. (i.e. if the cancellation of the order fails but the new order placement succeeds.)

• HTTP 429 return code is used when breaking a request rate limit.

• HTTP 418 return code is used when an IP has been auto-banned for continuing to send requests after receiving 429 codes.

• HTTP 5XX return codes are used for internal errors; the issue is on Trade.mn's side.