The HTTP status code of 200 usually indicates a successful invocation. If an error occurs during processing, HTTP status code 403 is usually returned, and the structure of the response is an errorResponse object. It contains two elements: a code element and a message element. The code element contains a number corresponding to the error conditions documented on the error code list page. The message element contains a text message that may provide further detail about the error. The response is formatted as XML by default, but the response_format input parameter can be used to specify either XML or JSON formatting.
The following HTTP status codes may be returned by calls to Luminate Online APIs.
| Code | Description |
| 200 | OK. Generally, indicates a successful invocation. May also be returned on error if call includes suppress_result_codes=true. |
| 302 | Redirect. The invocation may have been successful or an error may have occurred. A redirect parameter was specified in the request so the response is a redirection to that URL. |
| 403 | Forbidden. The most common error status, it indicates that the request was received and understood but an error occurred. Parse the content text for more information. |
| 405 | Bad Method. Indicates that the request was not sent using the "POST" HTTP method. |