1715427 - Response.blob() promise is rejected when the request URL is revoked after fetch

Status: UNCONFIRMED

(Core :: DOM: Networking, defect, P2)

Description

[peterho0218]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.212 Safari/537.36

Steps to reproduce:

Try the JavaScript code here: https://jsfiddle.net/Quicksilver0218/cbqxz43s/

1. Click the file input field and select any file.
2. Look at the console output.

Actual results:

The "Response.blob()" promise is rejected in Firefox.

Expected results:

The "Response.blob()" promise is resolved in Chrome, Edge and Opera.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::DOM: Networking' component, and is moving the bug to that component. Please revert this change in case you think the bot is wrong.

Comment 2

[Valentin Gosu [:valentin] (he/him)]

Anne, it's not entirely clear to me what the spec mandated behaviour is here

Comment 3

[peterho0218]

Other Body's methods such as arrayBuffer(), json(), text() are still working after revokeObjectURL(). It seems that blob() is the only difference.

Comment 4

[Anne (:annevk)]

This should work. In spec-theory we obtain a reference to the blob when the blob URL is parsed, so it getting revoked after that shouldn't influence the ability to fetch it or turn it into a new blob.

Comment 5

[(inactive) Nihanth Subramanya [:nhnt11]]

I didn't mean to mark this P1, not sure how that happened.