A book for engineers who are using OAuth based on a general understanding, to learn the latest best practices of OAuth 2.1 in an organized manner. New release from Auth-ya at Technical Book Festival 19. This is an updated version of the previous book, "A book for engineers who are using OAuth 2.0 based on a general understanding, to learn OAuth 2.0 in an organized manner while working hands-on," now updated from OAuth 2.0 to OAuth 2.1. #TechnicalBookFestival