Fetch API: Response construction with ReadableStream

Developers can now construct their own ReadableStream instances, and use one as a body for constructing a Response object. It enables streaming composed body data from a ServiceWorker to a page controlled by it.

Comments

Since M43, readable streams can be obtained (only) from the body attribute of the Response. Developers can now construct their own ReadableStream instances (http://crbug.com/503491), and use one for constructing a Response and serve it from a ServiceWorker. This feature had been available behind a flag since M49. A *Request* cannot yet be constructed with a ReadableStream as a body (for streaming uploads).

Demo

• https://jakearchibald.com/2016/streams-ftw/

Documentation

• https://streams.spec.whatwg.org/#rs
• https://developers.google.com/web/updates/2016/06/sw-readablestreams

Specification

Working draft or equivalent

Status in Chromium

Blink components: Blink>Network>FetchAPI

Enabled by default (launch bug) in:

• Chrome for desktop release 52
• Chrome for Android release 52
• Android WebView release 52
• Opera release 39
• Opera for Android release 39

Consensus & Standardization

• Firefox: In development
• Edge: No public signals
• Safari: In development
• Web Developers: Strongly positive

Owners

• domenic@chromium.org
• yhirano@chromium.org
• tyoshino@chromium.org

Last updated on 2017-07-25