I have one question. When I want return the status http of my request when in database we haven't data, for it's this status.
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                    You can use a protocol analyzer to inspect/monitor network packets, Wireshark is a useful program. – dave May 16 '18 at 13:54
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                    2Possible duplicate of [HTTP status code for "no data available" from an external datasource](https://stackoverflow.com/questions/9595151/http-status-code-for-no-data-available-from-an-external-datasource) – Ivan Smetanin May 16 '18 at 13:55