200 – OK – Everything is working

201 – OK – New resource has been created

204 – The call is valid but resource does not exist

304 – Not Modified – The client can use cached data

400 – Bad Request – The request was invalid or cannot be served. The exact error should be explained in the error payload. E.g. „The JSON is not valid“

401 – Unauthorized – The request requires authentication

403 – Forbidden – The server understood the request, but is refusing it or the access is not allowed.

404 – Not found – The URI format is incorrect.

500 – Internal Server Error – This error is not returned by the application but by the server.