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When using action=purge with forcelinkupdate and it hits the ratelimit, the following stacktrace is shown:

<?xml version="1.0"?><api servedby="srv296"><error code="internal_api_error_MWException" info="Exception Caught: Internal error in ApiResult::setContent: Bad parameter" xml:space="preserve">

#0 /usr/local/apache/common-local/php-1.18/includes/api/ApiBase.php(1241): wfDebugDieBacktrace('Internal error ...')
#1 /usr/local/apache/common-local/php-1.18/includes/api/ApiResult.php(177): ApiBase::dieDebug('ApiResult::setC...', 'Bad parameter')
#2 /usr/local/apache/common-local/php-1.18/includes/api/ApiBase.php(216): ApiResult::setContent(Array, Array)
#3 /usr/local/apache/common-local/php-1.18/includes/api/ApiPurge.php(94): ApiBase-&gt;setWarning(Array)
#4 /usr/local/apache/common-local/php-1.18/includes/api/ApiMain.php(692): ApiPurge-&gt;execute()
#5 /usr/local/apache/common-local/php-1.18/includes/api/ApiMain.php(358): ApiMain-&gt;executeAction()
#6 /usr/local/apache/common-local/php-1.18/includes/api/ApiMain.php(342): ApiMain-&gt;executeActionWithErrorHandling()
#7 /usr/local/apache/common-local/php-1.18/api.php(115): ApiMain->execute()
#8 /usr/local/apache/common-local/live-1.5/api.php(3): require('/usr/local/apac...')
#9 {main}

</error></api>

The line in action=purge is:
$this->setWarning( $this->parseMsg( array( 'actionthrottledtext' ) ) );