Wotcher TAG!

I'm requesting a TAG review of fetch streaming upload.

[One paragraph summary of idea, ideally copy-pasted from Explainer introduction]

• Explainer¹ (minimally containing user needs and example code): https://github.com/yutakahirano/fetch-with-streams/blob/master/streaming-upload.md
• Specification URL: https://fetch.spec.whatwg.org/
• Tests: /wpt/fetch, /wpt/service-workers
• User research: None
• Security and Privacy self-review²: https://github.com/yutakahirano/fetch-with-streams/blob/master/streaming-upload-security-privacy-questionnaire.md
• GitHub repo (if you prefer feedback filed there): https://github.com/whatwg/fetch
• Primary contacts (and their relationship to the specification):
  • [Yutaka Hirano] ([@yutakahirano]), [Google]
• Organization(s)/project(s) driving the specification: [Chromium]
• Key pieces of existing multi-stakeholder review or discussion of this specification:
• External status/issue trackers for this specification (publicly visible, e.g. Chrome Status): https://chromestatus.com/feature/5274139738767360

Further details:

• I have reviewed the TAG's Web Platform Design Principles
• Relevant time constraints or deadlines: [2022-07-19]
• The group where the work on this specification is currently being done:
• The group where standardization of this work is intended to be done (if current group is a community group or other incubation venue):
• Major unresolved issues with or opposition to this specification:
• This work is being funded by:

You should also know that...

[please tell us anything you think is relevant to this review]

We'd prefer the TAG provide feedback as (please delete all but the desired option):

🐛 open issues in our GitHub repo for each point of feedback

☂️ open a single issue in our GitHub repo for the entire review

💬 leave review feedback as a comment in this issue and @-notify [github usernames]

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¹ We require an explainer to give the relevant context for the spec review, even if the spec has some background information. For background, see our explanation of how to write a good explainer. We recommend the explainer to be in Markdown.

² A Security and Privacy questionnaire helps us understand potential security and privacy issues and mitigations for your design, and can save us asking redundant questions. See https://www.w3.org/TR/security-privacy-questionnaire/.