1897663 - HTTP status codes: Browser sometimes displays a completely white or black page instead of an error message

Status: NEW

(Firefox for Android :: Browser Engine, defect)

Description

[Denis Müller [:Webworkr]]

User Agent: Mozilla/5.0 (Android 14; Mobile; rv:127.0) Gecko/127.0 Firefox/127.0

Steps to reproduce:

Open a URL that leads to a 404 error.

Actual results:

In some cases, Fenix delivers a completely white or black side.

Expected results:

Generally deliver the standard or, if available, user-defined error page.

Comment 1

[Denis Müller [:Webworkr]]

Firefox beta
127.0b3 (Build #2016021375), hg-197cdbb72e16+
GV: 127.0-20240517091915
AS: 127.0

Comment 2

[Denis Müller [:Webworkr]]

Here are examples that deliver a 404 error under Google Chrome, but not under Firefox:

• https://www.heise.de/ix/heft/Kein-Einwurf-2762764.html

• http://www.intro.de/magazin/musik/23012024?PHPSESSID=6a7309879b42235ba20016604697b39b

Comment 3

[Denis Müller [:Webworkr]]

I also noticed this error under Nightly:

128.0a1 (Build #2016020879), hg-b2c1906d3f6e+
GV: 128.0a1-20240514215634
AS: 128.20240514050332

Comment 4

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

The bug has a release status flag that shows some version of Firefox is affected, thus it will be considered confirmed.

Comment 5

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

The severity field is not set for this bug.
:boek, could you have a look please?

For more information, please visit BugBot documentation.

Comment 6

[Daniel Veditz [:dveditz]]

The underlying handling was fixed in bug 1325876 and then enabled (for Desktop only) in bug 1944358. With those changes I get a our own "410" error page for the heise link in comment 2. www.intro.de seems to be gone or down so I couldn't test that.

If you change the pref to false in Fenix Nightly (about:config) you do get a browser error page instead of blank, but it's extremely generic and doesn't report the server error. A bit misleading, in fact: "Cannot Complete Request" implies we're having problems when it's the server telling us IT has the prohblem, and "addition information ... is currently unavailable" is basically a lie. That's probably why this hasn't been enabled yet for Fenix.

Comment 7

[Denis Müller [:Webworkr]]

HTTP status code 405 is also not displayed.

Comment 8

[Masatoshi Kimura [:emk]]

browser.http.blank_page_with_error_response.enabled is still disabled on Android because of bug 1325876 comment #32.
Sean Kim, do you have any plan to enable it on Android?

Comment 9

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

Redirect a needinfo that is pending on an inactive user to the triage owner.
:boek, since the bug has high severity and recent activity, could you have a look please?

For more information, please visit BugBot documentation.