OAuth 1.0 was the first version of the OAuth protocol, and while it's mostly replaced by OAuth 2.0, it's still important to understand — especially if you work with legacy systems or APIs like Twitter's old API versions. Let’s walk through the flow step by step and highlight how the Authorization Server figures out the user.

Apr 5, 2025 - 13:55
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OAuth 1.0 was the first version of the OAuth protocol, and while it's mostly replaced by OAuth 2.0, it's still important to understand — especially if you work with legacy systems or APIs like Twitter's old API versions.

Let’s walk through the flow step by step and highlight how the Authorization Server figures out the user.