HTTP Status Codes

The Oxford Dictionaries API attempts to return appropriate HTTP Status Codes for every request.

Code	Text	Description
200	OK	Success!
400	Bad Request	The request was invalid or cannot be otherwise served. An accompanying error message will explain further. For example, when the filters provided are unknown, the source and target languages in the translation endpoint are the same.
403	Authentication failed	The request failed due to invalid credentials, or you have reached your Application allowance. Please check that the app_id and app_key are correct, and that the URL you are trying to access is correct. You can manage your account at API Credentials, where you can also view your usage statistics.
404	Not Found	No information available or the requested URL was not found on the server. For example, when the headword could not be found, a region or domain identifier do not exist, or the headword does not contain any attribute that match the filters in the request. It may also be the case that the URL is misspelled or incomplete.
414	Request URI Too Long	Your word_id exceeds the maximum 128 characters. Reduce the string that is passed to the API by calling only individual words.
500	Internal Server Error	Something is broken. Please contact us so the Oxford Dictionaries API team can investigate.
502	Bad Gateway	Oxford Dictionaries API is down or being upgraded.
503	Service Unavailable	The Oxford Dictionaries API servers are up, but overloaded with requests. Please try again later.
504	Gateway timeout	The Oxford Dictionaries API servers are up, but the request couldn’t be serviced due to some failure within our stack. Please try again later.