OAuth2 Specification Version Enum (oauth2/OAuth2Version.java)

Enum representing OAuth2 spec versions (e.g., Bearer) with utilities for building authorization header values. Reuse when handling version‑specific OAuth2 flows in Spring Social integrations.

// Source: https://github.com/spring-attic/spring-social | License: Apache-2.0 | Copyright You must retain, in the Source form of any Derivative Works
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