Implement some flow and cleanup API call for file manager

resources/assets/scripts/api/http.js

@@ -0,0 +1,25 @@
+// @flow
+import axios from 'axios';
+import type { AxiosInstance } from 'axios';
+
+// This token is set in the bootstrap.js file at the beginning of the request
+// and is carried through from there.
+// const token: string = '';
+
+const http: AxiosInstance = axios.create({
+    'X-Requested-With': 'XMLHttpRequest',
+    'Accept': 'application/json',
+    'Content-Type': 'application/json',
+});
+
+// If we have a phpdebugbar instance registered at this point in time go
+// ahead and route the response data through to it so things show up.
+if (typeof window.phpdebugbar !== 'undefined') {
+    http.interceptors.response.use(response => {
+        window.phpdebugbar.ajaxHandler.handle(response.request);
+
+        return response;
+    });
+}
+
+export default http;