New Twiddle

adapters.application.js

import JSONAPIAdapter from "ember-data/adapters/json-api";
import { get, computed } from "@ember/object";
import { inject as service } from "@ember/service";
const captureQuery = () => {
  return function(store, type, query, options) {
    console.error({ options }, {query});
   	return this._super(...arguments);
  };
};

export default JSONAPIAdapter.extend({
  namespace: "api/v1",
  query: captureQuery()
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle', 
  init(){
    this._super(...arguments)
    this.store.query('my-model', {name: "test"}, {
    	adapterOptions: {
        headers: {
          "Accept-Language": this.locale
        }
      }
    })
  }

});

models.my-model.js

import Model from 'ember-data/model';
import attr from 'ember-data/attr';
import { belongsTo, hasMany } from 'ember-data/relationships';

export default Model.extend({
  name: attr()
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}