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Fix Node.js "fetch failed": Error Causes, AbortSignal.timeout, Retry-After and Retries

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Self-Hosting & Infra intermediate 6 min read $0.01 Updated 2026-10-20

Node 22 fetch troubleshooting verified against a local server: error.cause codes, connection refused, reset, DNS and bad port, AbortSignal.timeout, HTTP errors not throwing, Retry-After retries, body reuse and relative URLs.

Node's fetch throws just "fetch failed" and hides the real reason. Read error.cause, add timeouts with AbortSignal.timeout, remember fetch does not throw on 500, and retry 429s using Retry-After.

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#nodejs#fetch#timeout#retry#http

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