JQuery autocomplete on Cakephp 3.0

Hello,

i'm trying to use the following example of JQuery autocomplete with Cakephp

http://zenofcoding.com/2013/08/27/cakephp-and-jquery-auto-complete-revisited/

The important change between versions (if i'm not wrong) is how to enable the parsing of extensions

in both cases it is done in the ruotes.php file
in 2.3 by Router::parseExtensions()
in 3.0 by Router::extensions('json')

anyway, when i write into the input, nothing happens
i've checked with the browser debugging tool and no call to http://localhost:8765/cars/index.json occurs.
even if i write the url http://localhost:8765/cars/index.json?term=fo in the browser, i do not receive a json response, in fact no response or error message

any idea about what i'm doing wrong?

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