The following error codes exist among the methods of the ARGO Web API:

Error	HTTP Code	Description
Bad request	400	One or more checks may have failed. More details on the carried out checks can be found here
Wrong start_time	400	Use start_time url parameter in zulu format (like 2006-01-02T15:04:05Z) to indicate the query start time
Wrong end_time	400	Use end_time url parameter in zulu format (like 2006-01-02T15:04:05Z) to indicate the query end time
Wrong exec_time	400	Use exec_time url parameter in zulu format (like 2006-01-02T15:04:05Z) to indicate the exact probe execution time
Wrong granularity	400	The parameter value can be either daily or monthly
Unauthorized	401	The client needs to provide a correct authentication token using the header x-api-key
Forbidden	403	Access to the resource is forbidden due to authorization policy enforced
Item not found	404	Either the path is not found or no results are available for the given query
Content not acceptable	406	The Accept header either was not provided or was provided but did not contain any valid content types. Acceptable content types are application/xml or application/json