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The 503 That Wasn't a Rate Limit: A Layered LLM Gateway Debugging Retrospective

This story is from 2026-08-22. It is preserved in the archive; the latest stories are on the live feed.

Most LLM gateway failures look like upstream rate limits but are actually client-side connection problems, and a recent batch evaluation run proved the point. The run, which sent two hundred prompts against a free-tier model endpoint, failed with intermittent 503s for forty minutes before the real…

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  1. 2026-08-22 15:41 · DEV Community — AI
    The 503 That Wasn't a Rate Limit: A Layered LLM Gateway Debugging Retrospective

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