Jake Archibald • 9/15/2025

Fetch streams are great, but not for measuring upload/download progress

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This article details the technical limitations of using fetch streams to measure upload and download progress. It explains that while streams are useful for processing data, they provide inaccurate progress metrics when content is compressed (e.g., gzip or brotli), as the reported Content-Length differs from the actual decoded data size received in chunks.

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#fetch api #streams #Upload Progress
Fetch streams are great, but not for measuring upload/download progress

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