“OAuth 2 Detailed Explanation (1): Introduction and Authorization Code Mode” In this series, we mainly explain the four authorization modes defined in [RFC6749](https://ift.tt/T8QbIBF), and [RFC7636](https PKCE mode defined in ://ift.tt/7Vl5NS9). In this article, we will introduce the first pattern: Authorization Code Flow. But before that, we need to introduce some pre-concepts to facilitate understanding…
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