HTTP 503 – Service Unavailable

[Jones-S]

Hi there
I experienced a very weird error. While developing suddenly my graphql endpoint would not work anymore.

I get an html returned saying things like:

HTTP 503 – Service Unavailable – craft\web\ServiceUnavailableHttpException
craft\web\ServiceUnavailableHttpException in /Users/USERNAME/Documents/github/my-craft/vendor/craftcms/cms/src/web/Controller.php:163
Stack trace:
#0 /Users/USERNAME/Documents/github/my-craft/vendor/markhuot/craftql/src/Controllers/ApiController.php(37): craft\web\Controller->beforeAction(Object(yii\base\InlineAction))
#1 /Users/USERNAME/Documents/github/my-craft/vendor/yiisoft/yii2/base/Controller.php(155): markhuot\CraftQL\Controllers\ApiController->beforeAction(Object(yii\base\InlineAction))
#2 /Users/USERNAME/Documents/github/my-craft/vendor/craftcms/cms/src/web/Controller.php(187): yii\base\Controller->runAction('index', Array)
#3 /Users/USERNAME/Documents/github/my-craft/vendor/yiisoft/yii2/base/Module.php(528): craft\web\Controller->runAction('index', Array)
#4 /Users/USERNAME/Documents/github/my-craft/vendor/craftcms/cms/src/web/Application.php(299): yii\base\Module->runAction('craftql/api/ind...', Array)
#5 /Users/USERNAME/Documents/github/my-craft/vendor/yiisoft/yii2/web/Application.php(103): craft\web\Application->runAction('craftql/api/ind...', Array)
#6 /Users/USERNAME/Documents/github/my-craft/vendor/craftcms/cms/src/web/Application.php(284): yii\web\Application->handleRequest(Object(craft\web\Request))
#7 /Users/USERNAME/Documents/github/my-craft/vendor/yiisoft/yii2/base/Application.php(386): craft\web\Application->handleRequest(Object(craft\web\Request))
#8 /Users/USERNAME/Documents/github/my-craft/web/index.php(21): yii\base\Application->run()
#9 {main}

I have a local installation running with MAMP Pro.

• ✅ I can login to the admin, everything is normal
• ✅ I can test graphql queries in the graphiql of craftql.
• ✅ Local mysql is running, php as well

What I can't: Run the curl command
$ curl -H "Authorization: bearer TOKEN" -H "Content-type: application/json" -d '{"query":"{ helloWorld }"}' http://localdomain.test/api
It stopped working from one to another minute...
I even tried to add another token and run the curl command again.
Same error as described above.

Does somebody have an idea, where that could result from?
Stacktrace seems to show to a craftql thing as well.

I think it is related to these lines here:

From file: in /Users/USERNAME/Documents/github/my-craft/vendor/craftcms/cms/src/web/Controller.php
How could I suddenly not be authorized anymore?...

Thanks for any help, I really have no clue.

[Jones-S]

OK WOW:
Disabling this button in the backend:

Found at admin -> Settings > General

Will break graphql?...
A mere wonder I found out...

Why would this cause such an error?