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Issue 750901 link

Starred by 8 users

Issue metadata

Status: Fixed
Owner:
Closed: Dec 2017
Cc:
Components:
EstimatedDays: ----
NextAction: ----
OS: All
Pri: 1
Type: Bug

Blocked on:
issue 760924



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PlzNavigate: OOPIF requests do not show up in devtools.

Project Member Reported by alex...@chromium.org, Jul 31 2017

Issue description

What steps will reproduce the problem?
(1) Start Chrome with --site-per-process and --enable-browser-side-navigation
(2) Go to http://csreis.github.io/tests/cross-site-iframe.html
(3) Open Devtools and the network panel
(4) Click "Go cross-site (simple page)" (creates OOPIF)
(5) Notice that the request for the subframe does not show up under network requests!  Without PlzNavigate, it does show up, although it has issues showing some properties (see  issue 750898 ).
(6) Click "Go same-site" - that request is showing up fine.
(7) Repeat (4) - the cross-process request is still not showing up.

This seems to only affect OOPIFs - I've tried it with main frame cross-process navigations, and those requests show up fine.
 
Owner: caseq@chromium.org
Status: Assigned (was: Available)
Andrey, one more PlzNavigate network bug for you!
Blockedon: 760924
Labels: Proj-PlzNavigate
InspectorNetworkAgent::WillSendRequest() not being called before the request is sent, but after its response is received, probably explains this issue (or at least a part of it).
See  issue 760924 .

Comment 3 by creis@chromium.org, Oct 13 2017

Labels: -Pri-2 M-64 Pri-1
caseq@: Now that PlzNavigate has launched and there are increasing uses of OOPIFs, can we aim for a fix for this in the short term?
Cc: phistuck@chromium.org
As pointed out in https://groups.google.com/a/chromium.org/d/topic/chromium-dev/qN9uEg5yBLA/discussion the OOPIFs will be more common on the Canary channel between 2017-10-16 and 2017-10-23 because of the --site-per-process trial.  To improve the web developer experience during the trial, phistuck@ suggested adding a note with a warning about the impact of the trial - I've put together a CL adding a note: https://chromium-review.googlesource.com/#/c/chromium/src/+/721599.  See the attached screenshot for how the note ends up looking.  We can follow-up in Gerrit to word-smith the note as needed.

The note refers to this bug for more details, so let me share a few additional details that might be useful to whoever stumbles upon this bug:

- One workaround is to use chrome://net-internals

- Another workaround would be to disable the --site-per-process trial from the command line
  (this will only help for OOPIFs with web content;  extensions are put into OOPIFs since
   M56 and there is currently no way to avoid that):

    - To opt out of the experiment: Start Chrome with the following
      cmdline flag: --disable-features=site-per-process

    - To force into the experiment: Start Chrome with the following
      cmdline flag: --enable-features=site-per-process

    - To verify if OOPIFs are present: Visit
      https://csreis.github.io/tests/cross-site-iframe-simple.html
      and see if there's a subframe process for it in Chrome's Task Manager.
Ooops... I forgot to attach the screenshot in my previous comment :-)
DevTools-NetworkPanel-OOPIF-warning.png
65.9 KB View Download
Cc: -phistuck@chromium.org
I starred it instead, thank you. :)
Project Member

Comment 7 by bugdroid1@chromium.org, Oct 17 2017

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/9d7a30e2069b6d0bbf54f9ea0ac684d62423053c

commit 9d7a30e2069b6d0bbf54f9ea0ac684d62423053c
Author: Lukasz Anforowicz <lukasza@chromium.org>
Date: Tue Oct 17 20:43:51 2017

Temporary warning about the impact of  https://crbug.com/750901 .

Bug:  750901 
Change-Id: I488198ec1340c0eb7053a159d7699fc049d3443a
Reviewed-on: https://chromium-review.googlesource.com/721599
Commit-Queue: Ɓukasz Anforowicz <lukasza@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#509515}
[modify] https://crrev.com/9d7a30e2069b6d0bbf54f9ea0ac684d62423053c/third_party/WebKit/Source/devtools/front_end/network/NetworkLogView.js

Labels: Needs-Feedback
caseq@ Tested this issue on Mac OS 10.12.6 and Windows 7 using Chrome version 64.0.3243.0 and could observe as attached in the screen cast.

Can you please check and confirm if the fix is working as intended?

Thanks..
750901.webm
4.1 MB View Download
Labels: -Needs-Feedback
The CL from #c7 is not a real fix, but more of a temporary workaround.  We still need to come up with the right long-term fix.
I can repro this in 62.0.3202.94 even without --site-per-process, just PlzNavigate.
Re #c10: mind providing more details? You are running a page without any OOPIFs and do not see an iframe main request? What's the url?
I tested this by just navigating to example.com and inserting an iframe via the console:
var i = document.createElement("iframe");
i.src = "http://asdfasfasfasf.test");
document.body.appendChild(i)

See attached screenshot of the console and network panel, neither of which show the failed frame request.
Screen Shot 2017-12-04 at 1.21.02 PM.png
125 KB View Download
Screen Shot 2017-12-04 at 1.20.57 PM.png
98.8 KB View Download
Cc: ew...@chromium.org caseq@chromium.org
 Issue 750898  has been merged into this issue.
Cc: allada@chromium.org nick@chromium.org
 Issue 667533  has been merged into this issue.
Owner: dgozman@chromium.org
Project Member

Comment 16 by bugdroid1@chromium.org, Dec 13 2017

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/5fc3b9d05fc84e9c7e16905acb6672ede32c9667

commit 5fc3b9d05fc84e9c7e16905acb6672ede32c9667
Author: Dmitry Gozman <dgozman@chromium.org>
Date: Wed Dec 13 18:45:22 2017

[DevTools] Implement waitForDebugger for OOPIFs

Using NavigationThrottle for this. Since during throttling
the navigation has not committed yet, we have to create
agent host for soon-to-be-committed frame in advance.

Bug:  750901 
Change-Id: I88dbd982481b88eeec36209b6bf3ad7f74863200
Reviewed-on: https://chromium-review.googlesource.com/818076
Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523835}
[modify] https://crrev.com/5fc3b9d05fc84e9c7e16905acb6672ede32c9667/content/browser/devtools/protocol/devtools_protocol_browsertest.cc
[modify] https://crrev.com/5fc3b9d05fc84e9c7e16905acb6672ede32c9667/content/browser/devtools/protocol/target_auto_attacher.cc
[modify] https://crrev.com/5fc3b9d05fc84e9c7e16905acb6672ede32c9667/content/browser/devtools/protocol/target_auto_attacher.h
[modify] https://crrev.com/5fc3b9d05fc84e9c7e16905acb6672ede32c9667/content/browser/devtools/protocol/target_handler.cc
[modify] https://crrev.com/5fc3b9d05fc84e9c7e16905acb6672ede32c9667/content/browser/devtools/protocol/target_handler.h
[modify] https://crrev.com/5fc3b9d05fc84e9c7e16905acb6672ede32c9667/content/browser/devtools/render_frame_devtools_agent_host.cc
[modify] https://crrev.com/5fc3b9d05fc84e9c7e16905acb6672ede32c9667/content/browser/devtools/render_frame_devtools_agent_host.h
[modify] https://crrev.com/5fc3b9d05fc84e9c7e16905acb6672ede32c9667/content/browser/frame_host/navigation_handle_impl.cc
[add] https://crrev.com/5fc3b9d05fc84e9c7e16905acb6672ede32c9667/third_party/WebKit/LayoutTests/http/tests/inspector-protocol/target/wait-for-debugger-expected.txt
[add] https://crrev.com/5fc3b9d05fc84e9c7e16905acb6672ede32c9667/third_party/WebKit/LayoutTests/http/tests/inspector-protocol/target/wait-for-debugger.js
[modify] https://crrev.com/5fc3b9d05fc84e9c7e16905acb6672ede32c9667/third_party/WebKit/Source/devtools/front_end/network_log/NetworkLog.js

Project Member

Comment 17 by bugdroid1@chromium.org, Dec 14 2017

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/af3324398e7bae7a03b0548414b37a43a9e7e4ed

commit af3324398e7bae7a03b0548414b37a43a9e7e4ed
Author: Dmitry Gozman <dgozman@chromium.org>
Date: Thu Dec 14 18:24:44 2017

Revert "[DevTools] Implement waitForDebugger for OOPIFs"

This reverts commit 5fc3b9d05fc84e9c7e16905acb6672ede32c9667.

Reason for revert: crashes, see crbug.com/794927.

Original change's description:
> [DevTools] Implement waitForDebugger for OOPIFs
> 
> Using NavigationThrottle for this. Since during throttling
> the navigation has not committed yet, we have to create
> agent host for soon-to-be-committed frame in advance.
> 
> Bug:  750901 
> Change-Id: I88dbd982481b88eeec36209b6bf3ad7f74863200
> Reviewed-on: https://chromium-review.googlesource.com/818076
> Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
> Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#523835}

TBR=dgozman@chromium.org,caseq@chromium.org,pfeldman@chromium.org

Change-Id: I367776fd716614f4fd113c2f88ed3bfcbc5ac5c6
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug:  750901 
Reviewed-on: https://chromium-review.googlesource.com/826496
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524116}
[modify] https://crrev.com/af3324398e7bae7a03b0548414b37a43a9e7e4ed/content/browser/devtools/protocol/devtools_protocol_browsertest.cc
[modify] https://crrev.com/af3324398e7bae7a03b0548414b37a43a9e7e4ed/content/browser/devtools/protocol/target_auto_attacher.cc
[modify] https://crrev.com/af3324398e7bae7a03b0548414b37a43a9e7e4ed/content/browser/devtools/protocol/target_auto_attacher.h
[modify] https://crrev.com/af3324398e7bae7a03b0548414b37a43a9e7e4ed/content/browser/devtools/protocol/target_handler.cc
[modify] https://crrev.com/af3324398e7bae7a03b0548414b37a43a9e7e4ed/content/browser/devtools/protocol/target_handler.h
[modify] https://crrev.com/af3324398e7bae7a03b0548414b37a43a9e7e4ed/content/browser/devtools/render_frame_devtools_agent_host.cc
[modify] https://crrev.com/af3324398e7bae7a03b0548414b37a43a9e7e4ed/content/browser/devtools/render_frame_devtools_agent_host.h
[modify] https://crrev.com/af3324398e7bae7a03b0548414b37a43a9e7e4ed/content/browser/frame_host/navigation_handle_impl.cc
[delete] https://crrev.com/42d3293e07474a242d3193db8787e545f3ea6f50/third_party/WebKit/LayoutTests/http/tests/inspector-protocol/target/wait-for-debugger-expected.txt
[delete] https://crrev.com/42d3293e07474a242d3193db8787e545f3ea6f50/third_party/WebKit/LayoutTests/http/tests/inspector-protocol/target/wait-for-debugger.js
[modify] https://crrev.com/af3324398e7bae7a03b0548414b37a43a9e7e4ed/third_party/WebKit/Source/devtools/front_end/network_log/NetworkLog.js

Project Member

Comment 18 by bugdroid1@chromium.org, Dec 14 2017

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/50b30da048e3b3c659fb41dababae34f6afadd36

commit 50b30da048e3b3c659fb41dababae34f6afadd36
Author: Dmitry Gozman <dgozman@chromium.org>
Date: Thu Dec 14 21:39:35 2017

Reland "[DevTools] Implement waitForDebugger for OOPIFs"

This is a reland of 5fc3b9d05fc84e9c7e16905acb6672ede32c9667
Original change's description:
> [DevTools] Implement waitForDebugger for OOPIFs
>
> Using NavigationThrottle for this. Since during throttling
> the navigation has not committed yet, we have to create
> agent host for soon-to-be-committed frame in advance.
>
> Bug:  750901 
> Change-Id: I88dbd982481b88eeec36209b6bf3ad7f74863200
> Reviewed-on: https://chromium-review.googlesource.com/818076
> Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
> Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#523835}

TBR=pfeldman

Bug:  750901 
Change-Id: I96e6c083aa0de96799fbd4a529ae97019738ed87
Reviewed-on: https://chromium-review.googlesource.com/826318
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524191}
[modify] https://crrev.com/50b30da048e3b3c659fb41dababae34f6afadd36/content/browser/devtools/protocol/devtools_protocol_browsertest.cc
[modify] https://crrev.com/50b30da048e3b3c659fb41dababae34f6afadd36/content/browser/devtools/protocol/target_auto_attacher.cc
[modify] https://crrev.com/50b30da048e3b3c659fb41dababae34f6afadd36/content/browser/devtools/protocol/target_auto_attacher.h
[modify] https://crrev.com/50b30da048e3b3c659fb41dababae34f6afadd36/content/browser/devtools/protocol/target_handler.cc
[modify] https://crrev.com/50b30da048e3b3c659fb41dababae34f6afadd36/content/browser/devtools/protocol/target_handler.h
[modify] https://crrev.com/50b30da048e3b3c659fb41dababae34f6afadd36/content/browser/devtools/render_frame_devtools_agent_host.cc
[modify] https://crrev.com/50b30da048e3b3c659fb41dababae34f6afadd36/content/browser/devtools/render_frame_devtools_agent_host.h
[modify] https://crrev.com/50b30da048e3b3c659fb41dababae34f6afadd36/content/browser/frame_host/navigation_handle_impl.cc
[add] https://crrev.com/50b30da048e3b3c659fb41dababae34f6afadd36/third_party/WebKit/LayoutTests/http/tests/inspector-protocol/target/wait-for-debugger-expected.txt
[add] https://crrev.com/50b30da048e3b3c659fb41dababae34f6afadd36/third_party/WebKit/LayoutTests/http/tests/inspector-protocol/target/wait-for-debugger.js
[modify] https://crrev.com/50b30da048e3b3c659fb41dababae34f6afadd36/third_party/WebKit/Source/devtools/front_end/network_log/NetworkLog.js

Project Member

Comment 19 by bugdroid1@chromium.org, Dec 21 2017

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6d48911db91f5b34f1e13309be79e211ca67699c

commit 6d48911db91f5b34f1e13309be79e211ca67699c
Author: Dmitry Gozman <dgozman@chromium.org>
Date: Thu Dec 21 23:28:37 2017

[DevTools] Properly cleanup TargetHandler::Throttle pointer on desturction

It's owned by NavigationHandle and we failed to cleanup the
pointer to Throttle from an associated Session instance.

Bug:  750901 
Change-Id: I7963f17ca4d3c1564030fc1796da5a3921619c0b
Reviewed-on: https://chromium-review.googlesource.com/841145
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#525848}
[modify] https://crrev.com/6d48911db91f5b34f1e13309be79e211ca67699c/content/browser/devtools/protocol/target_handler.cc

Labels: Merge-Request-64
Status: Fixed (was: Assigned)
No crashes with protocol::TargetHandler or protocol::TargetAutoAttacher in a signature observed after 65.0.3300.0. Requesting merge of #c18 and #c19 to M64.
Project Member

Comment 21 by sheriffbot@chromium.org, Dec 27 2017

Labels: -Merge-Request-64 Hotlist-Merge-Review Merge-Review-64
This bug requires manual review: Reverts referenced in bugdroid comments after merge request.
Please contact the milestone owner if you have questions.
Owners: cmasso@(Android), cmasso@(iOS), kbleicher@(ChromeOS), abdulsyed@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot
Labels: TE-Verified-M65 TE-Verified-65.0.3309.0
Tested the issue using #65.0.3309.0 on Mac 10.12.6, Linux Ubuntu 14.04 and Win 10 as per the steps mentioned in comment#0. Observed the network requests int devtools network tab.

Please find the attached screencast. Hence adding the verified labels.

Thanks!!
750901.webm
3.9 MB View Download

Comment 23 Deleted

Labels: -Merge-Approved-65 Merge-Review-64
On a second thought, can we wait until M65? Seems like this bug has been around for a while now. And the changes look quite large?
Labels: -Merge-Review-64 Merge-Approved-64
Per discussion over email, this has been tested extensively in canary (over 2 weeks). Approving merge for M64. 
Project Member

Comment 26 by bugdroid1@chromium.org, Jan 3 2018

Labels: -merge-approved-64 merge-merged-3282
The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/65edd9a826574dc5d2d11d82a81ac9e0e2d50d28

commit 65edd9a826574dc5d2d11d82a81ac9e0e2d50d28
Author: Dmitry Gozman <dgozman@chromium.org>
Date: Wed Jan 03 01:20:24 2018

Reland "[DevTools] Implement waitForDebugger for OOPIFs"

This is a reland of 5fc3b9d05fc84e9c7e16905acb6672ede32c9667
Original change's description:
> [DevTools] Implement waitForDebugger for OOPIFs
>
> Using NavigationThrottle for this. Since during throttling
> the navigation has not committed yet, we have to create
> agent host for soon-to-be-committed frame in advance.
>
> Bug:  750901 
> Change-Id: I88dbd982481b88eeec36209b6bf3ad7f74863200
> Reviewed-on: https://chromium-review.googlesource.com/818076
> Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
> Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#523835}

TBR=dgozman@chromium.org, pfeldman

(cherry picked from commit 50b30da048e3b3c659fb41dababae34f6afadd36)

Bug:  750901 
Change-Id: I96e6c083aa0de96799fbd4a529ae97019738ed87
Reviewed-on: https://chromium-review.googlesource.com/826318
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#524191}
Reviewed-on: https://chromium-review.googlesource.com/848319
Cr-Commit-Position: refs/branch-heads/3282@{#388}
Cr-Branched-From: 5fdc0fab22ce7efd32532ee989b223fa12f8171e-refs/heads/master@{#520840}
[modify] https://crrev.com/65edd9a826574dc5d2d11d82a81ac9e0e2d50d28/content/browser/devtools/protocol/devtools_protocol_browsertest.cc
[modify] https://crrev.com/65edd9a826574dc5d2d11d82a81ac9e0e2d50d28/content/browser/devtools/protocol/target_auto_attacher.cc
[modify] https://crrev.com/65edd9a826574dc5d2d11d82a81ac9e0e2d50d28/content/browser/devtools/protocol/target_auto_attacher.h
[modify] https://crrev.com/65edd9a826574dc5d2d11d82a81ac9e0e2d50d28/content/browser/devtools/protocol/target_handler.cc
[modify] https://crrev.com/65edd9a826574dc5d2d11d82a81ac9e0e2d50d28/content/browser/devtools/protocol/target_handler.h
[modify] https://crrev.com/65edd9a826574dc5d2d11d82a81ac9e0e2d50d28/content/browser/devtools/render_frame_devtools_agent_host.cc
[modify] https://crrev.com/65edd9a826574dc5d2d11d82a81ac9e0e2d50d28/content/browser/devtools/render_frame_devtools_agent_host.h
[modify] https://crrev.com/65edd9a826574dc5d2d11d82a81ac9e0e2d50d28/content/browser/frame_host/navigation_handle_impl.cc
[add] https://crrev.com/65edd9a826574dc5d2d11d82a81ac9e0e2d50d28/third_party/WebKit/LayoutTests/http/tests/inspector-protocol/target/wait-for-debugger-expected.txt
[add] https://crrev.com/65edd9a826574dc5d2d11d82a81ac9e0e2d50d28/third_party/WebKit/LayoutTests/http/tests/inspector-protocol/target/wait-for-debugger.js
[modify] https://crrev.com/65edd9a826574dc5d2d11d82a81ac9e0e2d50d28/third_party/WebKit/Source/devtools/front_end/network_log/NetworkLog.js

Project Member

Comment 27 by bugdroid1@chromium.org, Jan 3 2018

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/fdbe91fa3a3d644f46ac91ac33af1952fc8a64a9

commit fdbe91fa3a3d644f46ac91ac33af1952fc8a64a9
Author: Dmitry Gozman <dgozman@chromium.org>
Date: Wed Jan 03 01:22:39 2018

[DevTools] Properly cleanup TargetHandler::Throttle pointer on desturction

It's owned by NavigationHandle and we failed to cleanup the
pointer to Throttle from an associated Session instance.

TBR=dgozman@chromium.org

(cherry picked from commit 6d48911db91f5b34f1e13309be79e211ca67699c)

Bug:  750901 
Change-Id: I7963f17ca4d3c1564030fc1796da5a3921619c0b
Reviewed-on: https://chromium-review.googlesource.com/841145
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#525848}
Reviewed-on: https://chromium-review.googlesource.com/848320
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/branch-heads/3282@{#389}
Cr-Branched-From: 5fdc0fab22ce7efd32532ee989b223fa12f8171e-refs/heads/master@{#520840}
[modify] https://crrev.com/fdbe91fa3a3d644f46ac91ac33af1952fc8a64a9/content/browser/devtools/protocol/target_handler.cc

The DevTools UI warning landed in #7 is still showing at ToT (and it uses a HTTP link instead of HTTPS). Can this be removed?
Good catch! I'll make a patch.
Project Member

Comment 30 by bugdroid1@chromium.org, Jan 27 2018

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/63b3fdd6748b1853404301e3e03a28b600b7e67b

commit 63b3fdd6748b1853404301e3e03a28b600b7e67b
Author: Dmitry Gozman <dgozman@chromium.org>
Date: Sat Jan 27 15:25:36 2018

[DevTools] Remove OOPIF notice in Network Panel

We now fully support network from OOPIFs, so the notice
is not needed anymore.

Bug:  750901 
Change-Id: If7bc2a291a35cbc9acc55c9248dd3a9f0efa994c
Reviewed-on: https://chromium-review.googlesource.com/887630
Reviewed-by: Andrey Lushnikov <lushnikov@chromium.org>
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532222}
[modify] https://crrev.com/63b3fdd6748b1853404301e3e03a28b600b7e67b/third_party/WebKit/Source/devtools/front_end/network/NetworkLogView.js

Labels: Needs-Feedback
Tested the issue using #66.0.3335.0 on Mac 10.13.1, Ubuntu 14.04 and Win 10 as per the steps mentioned in comment#0. Observed the network requests in devtools network tab.
Please find the attached screencast. 

But as per comment#28,#30-- Not seeing any devtools UI warning either in 66.0.3330.0 or 66.0.3334.0 [Builds before fix]
@dgozman: Could you please check the video and let us know the expected behaviour as per comment#28,#30 and please confirm the fix.

Thanks!
750901.mp4
2.8 MB View Download
Labels: -Needs-Feedback
The video looks correct.

The warning was there before on the empty Network Panel (like when Network Panel was opened in the video), right under "Perform a request...." text.
You can use "Clear" button at the top left at any moment to clear the panel and check whether warning is there.

Thank you for verification!

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