Aglet

Learn from recurring interrupted download resume failures

Repeated resume defects often combine range endpoint conventions with persistent partial files and changing document revisions. Learning should preserve the byte patterns that exposed corruption and document the evidence required before appending a response to local data, including when a restart is mandatory.

Keep the lesson for the next incident

  1. Cluster resume failures

    Group findings by range gaps, overlaps, final remainders, stale partials, revision changes, and deliberate restarts. Record the local state and the first user-visible consequence for each cluster.

  2. Document the append contract

    State how local length determines the next range, how response identity and total length are checked, how partial files are invalidated, and when restart is required. Include early, middle, and final-range examples.

  3. Trigger range review

    Require the patterned fixture when changing range requests, persistence, revision binding, retry handling, or completion checks. Assign an owner for the contract and record which evidence proves a resumed artifact equals the selected document.

What to carry forward

The learning record is complete when range arithmetic, partial-state identity, and completion evidence have explicit rules with boundary fixtures. If a source cannot support resume, document the restart behavior and partial-artifact treatment rather than implying continuation.

Technical background: MDN 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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