Crawl Barriers

Analysis of Wayback Machine crawl exclusions identifying explicit server security blocks (HTTP 403, 429) targeting U.S. Government web properties.

Host ↕	Total Raw Crawls ↕ Accumulated crawl metrics securely bounding out exactly 500 random physical URL subsets spanning across identical Application Hosts identically.	HTTP 200 ↕	HTTP 3xx ↕	HTTP 404/410 ↕	HTTP 403 ↕	HTTP 429 ↕	Block Ratio ↕	Primary Firewall Array
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