javascript - Laravel can't return true json response -

i have quite simple laravel controller:

class mycontroller extends controller {     public function list()     {         return response()->json(['a' => 'hello']);     } } 

when try open corresponding url in browser(i use google chrome) works fine. there {"a":"hello"} response , content type application/json.

but when receive data via javascript (i use fetch polyfill) see content type text/html. checked in googlechrome devtools , within code:

fetch("/list")     .then(function(response) {         console.log(response.headers.get('content-type')); // => 'text/html'         return response.json();     })     .then(function(json) {       })     .catch(function(error){      }); 

well i've got error - unexpected token < in json @ position 0.

i don't understand what's happened.

ps:

laravel version - 5.4, php version 7.0.15, xampp 3.2.2

fetch polyfill version - 2.0.3

google chrome version - 57.0.2987.133

and yes, sounds strange, in ms edge v.20.10240 works fine.

you need set header of request content type of json. dont know polyfill how jquery

 $.ajax({                 type: 'get',                 url: url,                 contenttype: 'application/json; charset=utf-8',                 success:                  error:              });