Build a blocklist pipeline you can explain.

Specify the contract before the endpoint

Define whether a response contains domain names, browser rules, or a richer classification dataset. State the character encoding, normalization rules, wildcard behavior, and treatment of exceptions. Consumers should not have to infer these from a few records.

Decide which fields are stable and which may evolve. Version the schema separately from the data snapshot so a newly classified domain does not imply a changed parser. Document what an empty response means, especially when a client normally receives many entries.

A small, explicit reference record

This fictional record illustrates a contract design. The reserved example domain is not a blocking recommendation or a live service.

{
  "schema_version": "1",
  "snapshot_id": "illustrative-snapshot",
  "domain": "ads.example",
  "category": "advertising",
  "include_subdomains": false,
  "review_status": "human-reviewed"
}

An actual integration should document the meaning of each category and review state. Include only the fields you can keep accurate over time; a precise-looking score without a defined interpretation does not improve the contract.

Make updates reversible

Fetch a candidate snapshot into a separate location, validate its syntax and expected shape, and then switch it into use as one deliberate action. Preserve the previous working version. A download failure should not silently replace a healthy dataset with an empty file.

Consider conditional requests, change summaries, and a full snapshot fallback when designing delivery. These are design options to assess for your workload, not a promised service level. The API design fieldnote develops the tradeoffs.

Track the decision, not private browsing

Operational records can focus on snapshot identifiers, validation outcomes, and aggregate failures. Think carefully before recording full request URLs: they may contain tokens or user-specific information. Choose the minimum evidence needed to investigate a rule.

For scored records, read the AI scoring guide. For hostname semantics and wildcard decisions, use the domain list reference. Keep classification separate from the policy that decides whether to block.