Validate webhook destinations through the restricted network boundary
An arbitrary callback URL could direct the sender toward unapproved network resources.
- Focused work estimate
- 3h + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Egress control
Estimated field mix
- Security50%
- Networking50%
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 logistics platform sends shipment events to partner endpoints. Partners need stable schemas and recovery semantics despite duplicate delivery, failures, and subscription changes.
Setup prerequisites
- Create a local webhook sender and receiver doubles with synthetic shipment events and disposable signing keys.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Enforce approved schemes, origins, and ports.
- Validate resolution and redirects for every delivery.
- Bind destinations to reviewed subscription revisions.
Implementation constraints
- Use local receiver doubles and an explicit lab allowlist.
Verification to include
- Deliver to an approved local receiver.
- Reject an unapproved redirect or changed destination authority.
Deliverables
- Webhook destination policy.
Rollout and recovery
Default to no external destinations until the policy is configured.
Value of the work
For the engineer: Practice public event contracts, delivery guarantees, and partner recovery workflows.
For the team: Provide inspectable asynchronous integration behavior with controlled retries and clear compatibility.
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.