chrome app proxy api always returns mode as system, even after removing proxy connection in chrome browser

Question

I wanted to check whether system uses proxy or not to make ajax requests in chrome app.

i tried the following chrome app api

chrome.proxy.settings.get(
          {'incognito': false},
          function(config) {console.log((config));});

i am always getting this result irrespective of adding proxy in browser or not

{"levelOfControl":"controllable_by_this_extension","value":{"mode":"system"}}

mode value always as system and direct is not coming while proxy disconnected