Design an incremental fetch loop using conditional requests and response handling.
Refresh 2,000 public product pages daily while minimizing unnecessary downloads. Store server validators, send conditional requests, treat 304 as a successful unchanged check, and parse only changed pages. A full daily recrawl feels simple, but it ignores HTTP feedback and creates avoidable load when most pages are unchanged. Store validators On each successful 200 response, save ETag, Last-Modified, source_url, observed_at, and content_hash. Validators are the server's way of helping you avoid unnecessary transfers. Keeping them with provenance makes the next run smarter. Send conditional headers On the next run, send If-None-Match with the saved ETag or If-Modified-Since with the saved…
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