Always verify API endpoints are live before building on them

Building a viral campaign tool that posted content to Twitter/X via their API endpoints

Significant Twitter/X API endpoints are deprecated (410 Gone) with no direct replacements. What the docs describe and what is actually available diverge substantially. An entire campaign workflow was designed and partially built before the deprecation was discovered — the kind of thing that only surfaces when you make the real HTTP call.

Live API calls returned 410 Gone responses. Cross-referencing the Twitter developer changelog confirmed the endpoints had been retired. The official docs had not been updated to reflect this.

Before designing any workflow that depends on a third-party API: make one real HTTP call to each endpoint you plan to use. Do this before writing a single line of integration code. A 410 or 403 at this stage saves hours of wasted work. If the endpoint returns data, spot-check that the response shape matches the docs — schemas drift too.

Some endpoints return 200 with degraded data rather than an error code — silent deprecation is harder to catch and requires comparing actual response fields against documented fields. Also does not apply to internal APIs where you control the server.

Is there a lightweight API health-check pattern that catches both hard deprecations (4xx) and silent schema drift in a single pass?

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