Apparently, there was a problem debugging LAMP and PHP built-in servers on phpleague route package. Comparing the output — /, / on LAMP and built-in servers in addition to /api/v1/ping supposed to emmit JSON validated array, the meld --diff *.txt saving the output var_dump($_SERVER); at the pre-route stage is promising —

Root path for built in and API route for built in $_SERVER dump

You can see clearly, that path information is assigned to only built-in server variables, meaning LAMP is unusable on a traditional HTTP open source foundation…