Only 3 of 22 Public APIs Responded Cleanly From a Locked-Down Dev Sandbox

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A developer tested 22 public API and data domains from a restricted sandbox environment and found that 17 never responded, with connections refused before any server could reply. Three endpoints, the npm registry, PyPI, and the crates.io index, returned normal results quickly. Two other domains reached their backends but returned explicit refusals, including a GitHub API path blocked by the sandbox's own proxy and a Google Books request that failed on an exhausted quota. The author notes that the failures look identical from the client side despite having different causes, which makes them hard to diagnose without reading response bodies. The findings highlight the practical cost of default-deny outbound network policies for research and data work.

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