Hello, Younghan! I enjoyed the great lecture! It was a really good lecture that did not disappoint! I was able to organize the knowledge that I had vaguely. Also, thanks to the comparison between POST and PUT and the HTTP status code, I think I was able to organize the confusing parts well! In particular, I didn't focus much on headers until now, but I'm reflecting on it. I want to watch this lecture again next time! Thank you!