Fetch upload streaming lets web developers make a fetch with a ReadableStream body. Fetch provides a generic definition of Request and Response objects (and other things involved with network requests).
Traditionally uploading byte arrays were implemented on WebSocket but it has made client/server code messy. Fetch upload streaming makes that simpler.
Unknown standards status - check spec link for status
Status in Chromium
Consensus & Standardization
Last updated on 2021-09-07