Bug 215485

Summary:	Implement transferable streams
Product:	WebKit	Reporter:	Adam Rice <ricea>
Component:	WebCore Misc.	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	jimmy, joan, pascalschilp, safwen.baroudi, sam.verschueren, tenphi, webkit-bug-importer, youennf
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Description Adam Rice 2020-08-13 19:07:02 PDT

Transferable streams permit streams to be transferred to a worker or other realm using postMessage(), where they can be used just like the original stream.

Example:

const rs = new ReadableStream();
window.postMessage(rs, '*', [rs]);

See the explainer https://github.com/whatwg/streams/blob/master/transferable-streams-explainer.md for more motivation.

See the spec change at https://github.com/whatwg/streams/pull/1053 and the web platform tests at https://github.com/web-platform-tests/wpt/pull/24546.

Comment 1 Radar WebKit Bug Importer 2020-08-20 19:07:16 PDT

<rdar://problem/67522801>

Comment 2 Jimmy Wärting 2023-01-13 13:29:30 PST

Importance += 1

Comment 3 youenn fablet 2023-10-03 12:25:41 PDT

*** Bug 262531 has been marked as a duplicate of this bug. ***

Comment 4 Andrey 2024-03-15 09:20:47 PDT

I accidentally found out that it only happens if you use the following header:
Cross-Origin-Embedder-Policy `credentialless` instead of `require-corp`.
Other engines are tolerant of this difference.

Is it on purpose?