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0511b76ada
Sameer's review on #28356/#28008 flagged that the new pass-through behaviors (preemptive 401 challenges, /.well-known/oauth-protected- resource proxying, upstream 401/403 propagation as MCPUpstreamAuthError, and Authorization-stripping when no x-litellm-api-key is supplied) were implicitly enabled for every server with auth_type=none plus Authorization in extra_headers. Existing users doing static bearer pass-through for non-OAuth reasons would have silently regressed. Make the detection rule explicit: extend the existing delegate_auth_to_upstream flag (previously oauth2-only) to also gate is_oauth_passthrough. Now requires flag + auth_type=None + Authorization in extra_headers, per Sameer's suggested detection rule. The UI toggle now appears for both modes (oauth2 PKCE passthrough and auth_type=none OAuth pass-through) with mode-appropriate copy. Update test fixtures to set the flag where the test intent is to exercise OAuth pass-through behavior, and add negative tests covering the new default-false case. |
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