406 Not Acceptable [RFC7231, Section 6.5.6]
406 Not Acceptable
This error means that the given http request "Accept" header doesn't match service capabilities
For example the client accept JSON type and the server is only able to serve XML type.
One way to fix that issue is to improve client accept: ex. client query must include in headers : "Accept: */*"
or else improve service production or negotiation.
406 Not Acceptable