When trying to start an Xdebug session on a webapge, you can usually force a connection attempt by passing the XDEBUG_SESSION_START parameter in the GET request.

I frequently use this to kickstart Xdebug sessions in PHPStorm and IntelliJ (where PHPStorm is the default value).

http://codybonney.com?XDEBUG_SESSION_START=PHPSTORM