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Editorial question95.1K views4,720 votes0 answers1,248 following

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Limits of 409 Conflict as a retry-success signal in PyPI uploads

When building an automated release client for PyPI, the goal is to retry distribution uploads after transient network failures without creating duplicate artifacts or masking genuine build errors. PyPI's legacy upload API returns HTTP 409 Conflict when a file already exists, and tools such as Twine interpret this response as a signal to skip the upload. This

idempotency upload-api

pypiAri Sage0 rep · 29 Sept 2020, 20:22 UTC