[Bug] Should not inject toolbar when response is expected to be application/json

[juslintek]

Injects toolbar even if request has any of the headers:
Content-Type: application/json
Accept: application/json

Via postman you have to add this header:
X-Requested-With: XMLHttpRequest

But sometimes it doesn't exist even if request is async. :-)

[barryvdh]

It should not add it with application/json content-type. Can you show your full response headers?

[github-grabaz]

I am seeing the same problem after installing.

Returning data from a route request using the following is injecting the toolbar:

// filename: web.php

    Route::get('/api/test', function () {
        $data = DB::connection('testdb')->table('testtable')->get();
        return $data->toJson();
    });