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New webhook testing tool simulates deterministic retry failures using Idempotency-Key sequences

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A developer has built a webhook testing endpoint that simulates specific failure scenarios in a repeatable, deterministic way, addressing a gap left by random error-rate testing. The tool assigns each unique Idempotency-Key its own ordered sequence of actions — such as dropping a connection, responding with a status code, or timing out — so engineers can reliably reproduce edge cases like duplicate order creation caused by lost responses. Each step is consumed only by authenticated requests, ensuring failed auth attempts do not interfere with the test sequence. The service runs on Cloudflare Workers and includes a reset API endpoint suited for use at the start of CI jobs. A free tier is available, offering up to three endpoints, 20 steps per sequence, and 500 requests per day.

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