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사용자 -> Line bot: request(@자연어)
Line bot -> server: webhook (source, message 등)
server -> Firebase: Google oAuth 확인
Firebase -> server: 로그인 성공
server -> api.ai: getQuery(자연어)
api.ai -> server: json(query)
server -> GA(Rserv): getChart(query)
GA(Rserv)-> server: chart.png
server->Line bot: post(chart.png)
Line bot->사용자: response(chart.png)