Solo Devs Can Block Surprise Cloud Bills With a 3-File Egress Guard at Boot

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A lightweight egress-guard pattern lets solo developers prevent unexpected API charges by blocking all outbound network connections except those on an explicit loopback allowlist. The approach wraps Python's socket.getaddrinfo and socket.create_connection at boot time, raising an error before any unauthorized external host can be reached. The policy is stored in a small JSON file so that any agent-generated change adding an external host becomes a visible diff in code review. The system requires just three files — allowlist.json, egress_guard.py, and a test module — and needs no cloud account to run. Its stated purpose is not security but cost control, acting as a wallet latch for one-person projects that need to ship quickly without inadvertently enabling billed third-party services.

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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