Вытащил http-клиент в отдельный компонент

HttpClient.qml

@@ -0,0 +1,30 @@
+import QtQuick 2.0
+
+QtObject {
+    id: root
+
+    signal reply(var data)
+    signal error(string text)
+
+    function get(url) {
+        var request = new XMLHttpRequest()
+
+        request.open('GET', url)
+        request.onreadystatechange = function () {
+            if (request.readyState !== XMLHttpRequest.DONE) {
+                return
+            }
+
+            if (request.status === 200) {
+                root.reply(JSON.parse(request.responseText))
+                return
+            }
+
+            root.error(qsTr("[%1] Request error: %2").
+                       arg(request.status).
+                       arg(request.statusText))
+        }
+
+        request.send()
+    }
+}