WebResponse: Cannot modify header information - headers already sent by SpecialCentralAutoLogin.php
Closed, DuplicatePublicPRODUCTION ERROR
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Authored By

	brennen
	Aug 8 2019, 6:45 PM

Description

Error

Request ID: XUxX8wpAMEkAAE@dj3YAAADU
Request URL: https://commons.wikimedia.org/wiki/Special:CentralAutoLogin/toolslist?returnto=Category%3AIdrus_Alwi&returntoquery=

message

[XUxX8wpAMEkAAE@dj3YAAADU] /wiki/Special:CentralAutoLogin/toolslist?returnto=Category%3AIdrus_Alwi&returntoquery=   ErrorException from line 208 of /srv/mediawiki/php-1.34.0-wmf.17/includes/WebResponse.php: PHP Warning: Cannot modify header information - headers already sent by (output started at /srv/mediawiki/php-1.34.0-wmf.17/extensions/CentralAuth/includes/specials/SpecialCentralAutoLogin.php:654)

trace

 	#0 [internal function]: MWExceptionHandler::handleError(integer, string, string, integer, array)
#1 /srv/mediawiki/php-1.34.0-wmf.17/includes/WebResponse.php(208): setcookie(string, string, integer, string, string, boolean, boolean)
#2 /srv/mediawiki/php-1.34.0-wmf.17/includes/block/BlockManager.php(441): WebResponse->setCookie(string, string, string, array)
#3 /srv/mediawiki/php-1.34.0-wmf.17/includes/block/BlockManager.php(408): MediaWiki\Block\BlockManager->setBlockCookie(MediaWiki\Block\DatabaseBlock, WebResponse)
#4 /srv/mediawiki/php-1.34.0-wmf.17/includes/deferred/MWCallableUpdate.php(38): MediaWiki\Block\BlockManager->MediaWiki\Block\{closure}()
#5 /srv/mediawiki/php-1.34.0-wmf.17/includes/deferred/DeferredUpdates.php(377): MWCallableUpdate->doUpdate()
#6 /srv/mediawiki/php-1.34.0-wmf.17/includes/deferred/DeferredUpdates.php(280): DeferredUpdates::attemptUpdate(MWCallableUpdate, Wikimedia\Rdbms\LBFactoryMulti)
#7 /srv/mediawiki/php-1.34.0-wmf.17/includes/deferred/DeferredUpdates.php(225): DeferredUpdates::run(MWCallableUpdate, Wikimedia\Rdbms\LBFactoryMulti, Monolog\Logger, BufferingStatsdDataFactory, string)
#8 /srv/mediawiki/php-1.34.0-wmf.17/includes/deferred/DeferredUpdates.php(145): DeferredUpdates::handleUpdateQueue(array, string, integer)
#9 /srv/mediawiki/php-1.34.0-wmf.17/includes/MediaWiki.php(608): DeferredUpdates::doUpdates(string, integer)
#10 /srv/mediawiki/php-1.34.0-wmf.17/includes/MediaWiki.php(574): MediaWiki::preOutputCommit(RequestContext, Closure)
#11 /srv/mediawiki/php-1.34.0-wmf.17/includes/MediaWiki.php(908): MediaWiki->doPreOutputCommit(Closure)
#12 /srv/mediawiki/php-1.34.0-wmf.17/includes/MediaWiki.php(523): MediaWiki->main()
#13 /srv/mediawiki/php-1.34.0-wmf.17/index.php(42): MediaWiki->run()
#14 /srv/mediawiki/w/index.php(3): require(string)
#15 {main}

Notes

4 of these since wmf.17. Adding a few relevant-seeming tags and subscribers.

Related Objects

Mentioned Here: T180050: PHP Warning: Recursion detected in RequestContext

Event Timeline

brennen created this task.Aug 8 2019, 6:45 PM

Restricted Application added a subscriber: Aklapper. · View Herald TranscriptAug 8 2019, 6:45 PM

This seems older then wmf.17, I can find same-ish logs as early as wmf.13 which lines up from a fix for T180050 from @MaxSem, so CCing him.

CentralAuth disables output buffering and outputs directly, avoiding OuptutPage methods in SpecialCentralAutoLogin::doFinalOutput(). Any ideas why it might be doing that?

In T230153#5404042, @MaxSem wrote:

CentralAuth disables output buffering and outputs directly, avoiding OuptutPage methods in SpecialCentralAutoLogin::doFinalOutput(). Any ideas why it might be doing that?

This might be a good question for @Tgr or @Anomie

In T230153#5404042, @MaxSem wrote:

CentralAuth disables output buffering and outputs directly, avoiding OuptutPage methods in SpecialCentralAutoLogin::doFinalOutput(). Any ideas why it might be doing that?

Because OutputPage does a lot of stuff that SpecialCentralAutoLogin doesn't need or want. It's designed for outputting HTML, usually with the skin, not images or JSON or JavaScript.

Note that RawAction does the same, as do some other things like SpecialExport when exporting and SpecialRevisionDelete when showing the deleted image. And endpoints like load.php and thumb.php don't use OutputPage at all (AFAIK).

Krinkle moved this task from Untriaged to Aug2019/1.34.wmf.17+ on the Wikimedia-production-error board.Aug 16 2019, 11:12 AM

• mmodell changed the subtype of this task from "Task" to "Production Error".Aug 28 2019, 11:06 PM

daniel moved this task from Inbox to Backlog on the Platform Team Workboards (Clinic Duty Team) board.Oct 8 2019, 9:57 AM

Tchanders closed this task as a duplicate of T227901: PHP warning on attempting to set a block cookie after CentralAuth auto login.Oct 8 2019, 8:33 PM

Aklapper removed a subscriber: Anomie.Oct 16 2020, 5:41 PM

WebResponse: Cannot modify header information - headers already sent by SpecialCentralAutoLogin.phpClosed, DuplicatePublicPRODUCTION ERRORActions