Support overriding HTTP client #81

ref DEV-2890

Author: tung2744

example/lib/main.dart

@@ -1,3 +1,4 @@
+import 'package:http/http.dart' as http;
 import 'dart:async' show StreamSubscription;
 import 'dart:io';
 import 'dart:convert';
@@ -22,6 +23,18 @@ ColorScheme colorSchemeFromContext(BuildContext context) {
   }
 }
 
+class MyHTTPClient extends http.BaseClient {
+  final http.Client _inner;
+
+  MyHTTPClient(this._inner);
+
+  @override
+  Future<http.StreamedResponse> send(http.BaseRequest request) {
+    request.headers["x-custom-header"] = "42";
+    return _inner.send(request);
+  }
+}
+
 void main() {
   if (Platform.isIOS) {
     wechatRedirectURI =
@@ -917,6 +930,7 @@ class _MyAppState extends State<MyApp> {
               ),
             )
           : null,
+      httpClient: MyHTTPClient(http.Client()),
     );
     _sub?.cancel();
     await authgear.configure();

lib/src/container.dart

@@ -280,6 +280,7 @@ class Authgear implements AuthgearHttpClientDelegate {
     this.preAuthenticatedURLEnabled = false,
     TokenStorage? tokenStorage,
     UIImplementation? uiImplementation,
+    Client? httpClient,
   })  : _tokenStorage = tokenStorage ?? PersistentTokenStorage(),
         _uiImplementation = uiImplementation ?? DeviceBrowserUIImplementation(),
         _storage = PersistentContainerStorage(),
@@ -288,7 +289,7 @@ class Authgear implements AuthgearHttpClientDelegate {
       namespace: name,
       sharedStorage: _sharedStorage,
     );
-    final plainHttpClient = Client();
+    final plainHttpClient = httpClient ?? Client();
     final authgearHttpClient = AuthgearHttpClient(this, plainHttpClient);
     _apiClient = APIClient(
       endpoint: endpoint,