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HTTP 200 Responses Can Still Break API Clients, Developer Warns

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A developer has highlighted a critical blind spot in API monitoring: a server can return a 200 OK status while still delivering a response that breaks dependent clients due to subtle structural changes. Standard uptime checks confirm DNS resolution, TLS handshakes, and response times, but do not verify whether the response payload still matches the structure a client expects. The author categorizes API dependency failures into four types — availability, shape, contract, and behavior — arguing each warrants distinct alerts rather than a single vague incident notification. To address this, they built a tool called DependSignal that probes APIs, compares JSON response shapes against prior observations, and flags structural changes such as type shifts or field removals with specific rule-based evidence. The project is publicly accessible without credentials, and the developer is still refining how to filter noise based on what different teams consider a breaking change.

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