如何使用xdebug与路由？

I am using xdebug for my PHP scripting. For now, this is working quiet good.

What doesn't work, is using a breakpoint for AJAX calls, which have a specific route. For example, within my symfony application, I defined the following route: Point /relationlist/fetchJsonList to function /extensions/vendor/cnd/relationlist/Extension.php::fetchContentElementArray()

The breakpoints within this method never breaks. I have tried to

1. append the XDEBUG_SESSION_START=sublime.xdebug
2. use the Chrome xdebug extension

My PHP xdebug module settings: https://jsbin.com/tebofifete

Further info: I am trying to debug an extension, where I use the following to declare my route.

$this->app->get("/relationlist/finditems/{contenttype}/{field}/{search}", array($this, 'findItems'));

Any suggestions?