updated the server to send applicatoin/json as contenttype

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# FOUND        2 LINES WITH console.log calls!!!!
#
# ARE YOU SURE YOU WANT TO COMMIT THESE LINES?!?!?!
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# part-2-the-api/server.js:    console.log("server started on port " + app.get('port'));
# part-3-the-ui/server.js:    console.log("server started on port " + app.get('port'));
#
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