Aglet

Investigate OAuth redirect validation failures

Investigation should explain the first mismatch in one authorization attempt. Pair matching and altered redirect fixtures, then follow state through callback and exchange. Keep host registration, stale session, state loss, and environment configuration as competing explanations using synthetic data and redacted state.

Build a useful investigation brief

  1. Build callback fixtures

    Create matching URI, trailing-slash difference, wrong host, missing state, expired session, and callback for another environment. Record expected safe outcome before execution. Use synthetic codes and state labels; never store redeemable credentials.

  2. Trace request and session

    Capture configured and sent URI labels, authorization start, state correlation, callback route, session lookup, and exchange result. Compare the first divergence between matching and failing cases. Record client revision and environment without raw query secrets.

  3. Challenge the registration story

    Vary one host, path, state, session age, or environment at a time. Confirm the callback check is literal and the state check binds one attempt. If token exchange still fits several causes, name the unavailable server observation.

What to carry forward

The investigation is ready when fixtures show URI, state, session, callback, and exchange transitions for one attempt. Recommend a narrow registration or session change. Keep token and external authorization behavior outside the conclusion when unobserved. Keep callback state tied to one attempt.

Technical background: RFC Editor reference.

Keep the decision with the work.

Use a Work Item in Aglet to record the problem, the evidence you have, and the next decision. Add an owner and priority, then keep updates in the discussion so the next person can follow the reasoning.

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