1521239 - Nightly regression on XHR from worker

Status: RESOLVED FIXED

(Core :: DOM: Security, defect)

Description

[alonzakai]

Attachment: test.js

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:66.0) Gecko/20100101 Firefox/66.0

Steps to reproduce:

Run a webserver like

python -m SimpleHTTPServer

with the two files attached, then browse to

http://localhost:8000/test.html

Actual results:

Looking in the web console, it shows

sending! http://localhost:8888/report_result?0
sent!

Looking in the network tab (and reloading), there is no network request sent to there, but the source code is

xhr.open('GET', url, !$1);
console.log('sending! ' + url);
xhr.send();
console.log('sent!');

so it should have been sent.

Expected results:

This is a regression in firefox nightly, I think in the last few days. It worked in older firefox and still works in chrome, that is, the network tab shows a network request sent as expected.

Comment 1

[alonzakai]

Attachment: test.html

Comment 2

[alonzakai]

Noticed on Emscripten CI, which runs nightly (tests: browser.test_single_file_html, browser.test_single_file_worker_js; see https://github.com/emscripten-core/emscripten/pull/7895).

Comment 3

[Matthias Versen [:Matti]]

c:>mozregression --good=2019-01-10 --arg="https://matti.port0.org/bug1521239/test.html"

2:54.51 INFO: No more inbound revisions, bisection finished.
2:54.51 INFO: Last good revision: 177103817494df65f31adc379f46af1dac849d10
2:54.51 INFO: First bad revision: 9fedba33cfa3ceb88437433072951f26bf9f9a90
2:54.51 INFO: Pushlog:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=177103817494df65f31adc379f46af1dac849d10&tochange=9fedba33cfa3ceb88437433072951f26bf9f9a90

Comment 4

[Sylvestre Ledru [:Sylvestre]]

Recent regression, I think we should track that.

Comment 5

[Jonathan Kingston [:jkt] he/him]

alonzakai thanks for the report, we have reverted the change in nightly so this should hopefully now be fixed. I will verify once the revert is merged back in.