The following are the most common response codes for MDEX Engine:
- 200: OK. The MDEX Engine successfully processed the query.
- 404: Not Found. The query sent to the MDEX Engine was in an incomprehensible format (e.g. “/favicon.ico”), or the query specified a navigation descriptor that does not exist. The most common causes of 404s are browser bookmarks/favorites that are no longer valid, direct browser queries to the MDEX Engine that produce favicon requests, and typos.
- 408: Request Timeout. The client that produced the request (typically the Endeca API) went away before the MDEX Engine could write the response to it. Typically this means that the request took a very long time to complete and the requesting application timed out before the MDEX Engine returned a response. Empty requests also often generate 408 codes.