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Error with switching between VisualEditor and New Wikitext Source Editor in dual tab environment
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Description

Problem: Whether enabling dual or single edit editing in Special:ManageWiki (screenshot #1| | screenshot #2), the following error is returned, when in Visual Editing mode, "Error loading data from server: apierror-visualeditor-docserver-http-error: (curl error: 52) Server returned nothing (no headers, no data). Would you like to retry?"

Reproducable? Yes, tested on theoriegnqc and reproduced on meta

What Should Happen: Whether using single- or dual-edit tabbed environment, VisualEditor should switch between the source and visual editing GUI environment seamlessly.

System Information:
Vivaldi 3.1.1929.45 (Stable channel) (64-bit)
Revision 1eb3263017ed42270818939fbff241845938a81f
OS Windows 10 OS Version 1909 (Build 18363.900)
JavaScript V8 8.3.110.13
Flash 32.0.0.387 C:\WINDOWS\system32\Macromed\Flash\pepflashplayer64_32_0_0_387.dll
User Agent Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.119 Safari/537.36
Command Line "C:\Users\Wylie\AppData\Local\Vivaldi\Application\vivaldi.exe" --flag-switches-begin --flag-switches-end --enable-audio-service-sandbox --ppapi-flash-path="C:\WINDOWS\system32\Macromed\Flash\pepflashplayer64_32_0_0_387.dll" --save-page-as-mhtml
Executable Path C:\Users\Wylie\AppData\Local\Vivaldi\Application\vivaldi.exe
Profile Path C:\Users\Wylie\AppData\Local\Vivaldi\User Data\Default

Event Timeline

Dmehus triaged this task as High priority.Jul 10 2020, 21:41
Dmehus created this task.

I’m not sure what the issue is as I cannot reproduce.

@Paladox What web browser are you using, and what are your settings set to in Special:Preferences or Special:GlobalPreferences? It may make a difference whether you've enabled, or disabled, the new wikitext editor in your preferences. Frances Amadar and I can definitely produce this error on multiple wikis.

Reception123 lowered the priority of this task from High to Normal.Jul 11 2020, 05:25

I’m not sure what the issue is as I cannot reproduce.

Can you not see it here? https://theoriegnqc.miraheze.org/wiki/Page_Principale?action=edit

Error message:

Debugging, as far as capabilities I possess:
Not working VisualEditor configuration (from running mw.config.values in console):

Working VisualEditor configuration (from one of my wikis):

This has Been happening to me as well when I try to edit in ASW (Astonishing Scratcher Wiki)

Universal_Omega assigned this task to Paladox.

Quoting an announcement made by @Paladox on Discord:

Hello all! We have figured out why some of you have been receiving an error 52 when using VisualEditor. Clearing your cookies should fix it. This appears to have affected chromium powered browsers only. We think this may be related to a change we deployed over the summer relating to SameSite in the cookies. We've confirmed clearing cookies fixed the issue.