fix: remove Keep-Alive header that causes fetch failures in Node.js/Lambda#67
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cnharrison merged 1 commit intomainfrom Jan 20, 2026
Merged
fix: remove Keep-Alive header that causes fetch failures in Node.js/Lambda#67cnharrison merged 1 commit intomainfrom
cnharrison merged 1 commit intomainfrom
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…ambda The Keep-Alive header with default value 'timeout=200' was causing all API requests to fail in Node.js environments (including AWS Lambda) because Node's undici HTTP client rejects this header as invalid. Error: InvalidArgumentError: invalid keep-alive header code: 'UND_ERR_INVALID_ARG' This removes the Keep-Alive header from all API requests and the keepAlive option from the Options and RequestOptions interfaces. Fixes DEVXP-74 Co-Authored-By: christopher.harrison@flatfile.io <cnharrison@gmail.com>
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mmccooyyy
approved these changes
Jan 20, 2026
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Summary
Removes the
Keep-Aliveheader that was introduced in v1.23.1, which causes all API requests to fail in Node.js 18+ environments (including AWS Lambda).The header
Keep-Alive: timeout=200is rejected by Node's undici HTTP client withInvalidArgumentError: invalid keep-alive header, causing requests to fail before they're even sent. This manifests asFlatfileError: fetch failedwithstatus: 0.Changes across 42 files:
Keep-Aliveheader from all API request headerskeepAliveoption fromOptionsandRequestOptionsinterfacesReview & Testing Checklist for Human
grep -r "Keep-Alive\|keepAlive" src/to confirm complete removalRecommended test plan: Install this branch in a Lambda function or Node 18+ project and verify API calls succeed where they previously failed with v1.23.1.
Notes