fetch() upload streaming

Category: Network / Connectivity
Type: New or changed feature
Status: Origin trial (Chrome 105)
Intent stage: Prepare to ship

Summary

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).

Motivation

Traditionally uploading byte arrays were implemented on WebSocket but it has made client/server code messy. Fetch upload streaming makes that simpler.

Standards & signals

Specification: https://fetch.spec.whatwg.org/#concept-body-stream
Firefox: Positive — No signals on the standards-position ticket. Annevk has been active on the standards discussions. Positive at TPAC 2019 [1].
Safari: Support — No signals on the standards-position ticket. Positive at TPAC 2019 [1]. [1] https://docs.google.com/document/d/1q090ovJ4gd8wSfVtvuoZLMZ51YkiFDsEZ0Jiqi41Iys/edit#heading=h.85gziabhajhg
Web developers: Positive — https://github.com/whatwg/fetch/issues/1438#issuecomment-1150755587 https://github.com/whatwg/fetch/issues/1438#issuecomment-1167984830
Tracking bug: https://bugs.chromium.org/p/chromium/issues/detail?id=688906

Docs: http://bit.ly/3asqra2

Explainers: https://bit.ly/2SVvKbR

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