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Status codes
The web service returns the following HTTP status codes.
| Code | Status | Description |
| 200 | OK | A 200 HTTP status code will be returned if your query is successfully processed and the data are returned. |
| 304 | No changes | A 304 HTTP status code will be returned if there have been no changes to the data since the timestamp supplied in the If-Modified-Since header. |
| 400 | Syntax error | If there is a syntactic or semantic issue with the parameters you supplied, a 400 HTTP status code will be returned. |
| 404 | No results found | A 404 HTTP status code will be returned if there are no results matching the query. |
| 406 | Not Acceptable | If you ask for a resource representation that we do not support, a 406 HTTP status code will be returned. To view the supported representations, please see the “Content negotiation” section. |
| 500 | Internal Server Error | When there is an issue on our side, a 500 HTTP status code will be returned. Feel free to try again later or to contact our support hotline. |
| 501 | Not implemented | Our web service offers a subset of the functionality offered by the SDMX RESTful web service specification. When you use a feature that we have not yet implemented, a 501 HTTP status code will be returned. |
| 503 | Service unavailable | If our web service is temporarily unavailable, a 503 HTTP status code will be returned. |