It appears I'm having an issue similar to [[ https://phabricator.wikimedia.org/T122401 | this one ]] wherein my Math extension (installed on a fresh, recent copy of Mediawiki) can't render any formulas and gives the error
> [780b446abf8a946e1cdb7c79] /wiki/index.php?title=Special:MathStatus MWException from line 213 of /var/www/html/wiki/extensions/Math/MathRestbaseInterface.php: Math extension can not find Restbase URL. Please specify $wgMathFullRestbaseURL.
The issue linked, however, indicates that the problem goes away if you set the math extension to render PNGs but I'm having problems across the board. I've tried setting the system to render PNGs only, or even just plain source with no luck: the same error keeps appearing on the Special:MathStatus page.
Here's the backtrace from MathStatus:
```
Backtrace:
#0 /var/www/html/wiki/extensions/Math/MathRestbaseInterface.php(352): MathRestbaseInterface->getUrl(string)
#1 /var/www/html/wiki/extensions/Math/MathRestbaseInterface.php(110): MathRestbaseInterface->getCheckRequest()
#2 /var/www/html/wiki/extensions/Math/MathRestbaseInterface.php(103): MathRestbaseInterface->checkTeX()
#3 /var/www/html/wiki/extensions/Math/MathRestbaseInterface.php(395): MathRestbaseInterface->calculateHash()
#4 /var/www/html/wiki/extensions/Math/MathRestbaseInterface.php(95): MathRestbaseInterface->getContentRequest(string)
#5 /var/www/html/wiki/extensions/Math/MathRestbaseInterface.php(224): MathRestbaseInterface->getContent(string)
#6 /var/www/html/wiki/extensions/Math/MathRenderer.php(657): MathRestbaseInterface->getSvg()
#7 /var/www/html/wiki/extensions/Math/MathMathML.php(357): MathRenderer->getSvg()
#8 /var/www/html/wiki/extensions/Math/MathMathML.php(398): MathMathML->correctSvgStyle(NULL)
#9 /var/www/html/wiki/extensions/Math/MathMathML.php(466): MathMathML->getFallbackImage()
#10 /var/www/html/wiki/extensions/Math/SpecialMathStatus.php(70): MathMathML->getHtmlOutput()
#11 /var/www/html/wiki/extensions/Math/SpecialMathStatus.php(52): SpecialMathStatus->testSpecialCaseText()
#12 /var/www/html/wiki/extensions/Math/SpecialMathStatus.php(42): SpecialMathStatus->runMathMLTest(string)
#13 /var/www/html/wiki/includes/specialpage/SpecialPage.php(479): SpecialMathStatus->execute(NULL)
#14 /var/www/html/wiki/includes/specialpage/SpecialPageFactory.php(576): SpecialPage->run(NULL)
#15 /var/www/html/wiki/includes/MediaWiki.php(282): SpecialPageFactory::executePath(Title, RequestContext)
#16 /var/www/html/wiki/includes/MediaWiki.php(745): MediaWiki->performRequest()
#17 /var/www/html/wiki/includes/MediaWiki.php(519): MediaWiki->main()
#18 /var/www/html/wiki/index.php(43): MediaWiki->run()
#19 {main}
```