I am working as a backend developer, but it is really well organized and I learned a lot. In fact, I have come across many blog posts and other lectures that are not organized this systematically. The content is the content, but the concepts and standards that were provided will be a great asset to me. This lecture is a basis for judging things that were difficult to judge on my own in practice, such as basic knowledge of HTTP, design standards, and situational application standards for each header. Thank you for your hard work in creating such a high-quality lecture.