200 OK Is Not the Same as "It Works"

Short summary

HTTP 200 status codes lie—pages can render blank, buttons can vanish, or third-party scripts can break the experience without changing the HTTP response. Three monitoring layers catch what status-code checks miss: enhanced health checks (blank-render and console-error detection), visual regression tests (pixel-by-pixel screenshot diffs), and journey tests (headless-browser flows through signup/checkout). Implement in priority order: upgrade health checks first, add one critical-flow journey test second, add visual diffs last.

• •HTTP 200 OK responses don't guarantee the app works—JavaScript errors, failed resources, and broken third-party scripts can break user flows while status codes stay green
• •Three monitoring layers catch different failure types: enhanced health checks (rendering and console errors), visual regression (screenshot diffs), and journey tests (automated user flows)
• •Prioritize: upgrade health checks immediately to catch silent failures, then add one journey test for your highest-revenue flow, then layer in visual regression detection

Generated with AI, which can make mistakes.