Revalidate every redirect before following it
An approved endpoint redirects the importer to an unapproved destination.
- Focused work estimate
- 2h 30m + prerequisites
- Priority in the scenario
- High
- Engineering practice
- HTTP · Trust boundaries
Estimated field mix
- Security60%
- Networking40%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
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Project context
A fictional content-import service accepts document URLs. The team needs explicit destination approval, redirect handling, and response limits before enabling imports.
Setup prerequisites
- Create a local HTTP destination simulator and DNS double with authorized address cases; contact no real external hosts.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Validate each redirect target independently.
- Bound redirect count.
- Prevent credentials or sensitive headers crossing origins.
Implementation constraints
- Do not inherit destination approval from the first URL.
Verification to include
- Follow an approved same-policy redirect.
- Reject an unapproved target and a redirect loop.
Deliverables
- Redirect policy checks.
Rollout and recovery
Disable redirects by default until the policy is configured.
Value of the work
For the engineer: Practice URL interpretation, network policy enforcement, and resource controls.
For the team: Provide a reusable fetch boundary that makes destination authority and failure behavior inspectable.
Evidence boundaries
Outcome Evidence: Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.
Ownership Evidence: Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence.