Class xử lí nội dung lỗi
Chuyển conf vô đúng thư mục
Thêm các tập tin báo lỗi
Thêm file http_error.cpp và http_error.h
Sửa lại phần đọc file cấu hình, chỉ cho đọc trong thư mục cấu hình
Thêm chức năng đọc file trong thư mục cơ sở (jailed)
Thêm xử lí lỗi 400 (bad request)
Fix method append
Cho phép trả về reference header
Method start() trả về bool thay vì int
Thêm header chuẩn và mime chuẩn
Trả về lỗi 400 tốt
Thêm các ràng buộc khi chạy server
Sửa các đường dẫn và thêm ERROR_400
Thêm http_error