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  • bitdays.co.kr/2021/10/14/%25EC%2585%2580%25EB%25A3%25B0%25EB%259F%25AC-m2m-%25EC%258B%259C%25EC%259E%25A5-%25ED%2581%25AC%25EA%25B8%25B0-%25EB%25B6%2584%25EC%2584%259D%25EC%2597%2590-%25EC%259D%2598%25ED%2595%25B4-%25ED%2598%2584%25EC%259E%25AC-%25EC%2582%25B0%25EC%2597%2585-%25ED%2598%2584%25ED%2599%25A9-%25EB%25B0%258F-%25EC%2584%25B1/ (port 80)