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양치기들에게 나타나신 하나님

1 minute read

Luke 2:8-9 “And there were shepherds living out in the fields nearby, keeping watch over their flocks at night. 9 An angel of the Lord appeared to them, and ...

False alarm from bots

less than 1 minute read

I'm on call this week, and whenever there's alert, it comes to my mobile. I've had Error rate > 5% alert from PagerDuty the other day. I've acknowledged t...

Dictionary.Insert Null reference error

less than 1 minute read

최근에 OAuth를 이용한 로그인 시스템을 구현하면서 login client를 NuGet Package로 만들었었다. 다른 개발자들이 쉽게 로그인 기능을 이용할 수 있도록. 그런데 자꾸만 acquired token을 저장하는 static Dicionary에서 Null Referen...

C#’s async, await, and .Result

3 minute read

In Market Invoice, there are many places where async and await are used. Recently, I introduced a bug that an operation gets deadlocked by replacing await wi...