https://nginxstore.com/blog/api-gateway/%eb%8b%b9%ec%8b%a0%ec%9d%98-api-gateway%ec%97%90-%ea%b3%a0%ec%84%b1%eb%8a%a5-waf%eb%a5%bc-%ec%89%bd%ea%b2%8c-%ed%86%b5%ed%95%a9%ed%95%98%eb%8a%94-%eb%b0%a9%eb%b2%95/