fix: #1428

@@ -192,11 +192,11 @@ class GetHttpClient {
       });
 
       if (authenticate) await _modifier.authenticator!(request);
-      await _modifier.modifyRequest(request);
+      final newRequest = await _modifier.modifyRequest<T>(request);
 
-      var response = await _httpClient.send<T>(request);
+      var response = await _httpClient.send<T>(newRequest);
 
-      await _modifier.modifyResponse(request, response);
+      await _modifier.modifyResponse(newRequest, response);
 
       if (HttpStatus.unauthorized == response.statusCode &&
           _modifier.authenticator != null &&
@@ -205,14 +205,14 @@ class GetHttpClient {
           handler,
           authenticate: true,
           requestNumber: requestNumber + 1,
-          headers: request.headers,
+          headers: newRequest.headers,
         );
       } else if (HttpStatus.unauthorized == response.statusCode) {
         if (!errorSafety) {
           throw UnauthorizedException();
         } else {
           return Response<T>(
-            request: request,
+            request: newRequest,
             headers: response.headers,
             statusCode: response.statusCode,
             body: response.body,

@@ -31,12 +31,15 @@ class GetModifier<T> {
     _requestModifiers.remove(interceptor);
   }
 
-  Future<void> modifyRequest(Request request) async {
+  Future<Request<T>> modifyRequest<T>(Request<T> request) async {
+    var newRequest = request;
     if (_requestModifiers.isNotEmpty) {
       for (var interceptor in _requestModifiers) {
-        await interceptor(request);
+        newRequest = await interceptor(newRequest) as Request<T>;
       }
     }
+
+    return newRequest;
   }
 
   Future<void> modifyResponse(Request request, Response response) async {

@@ -74,6 +74,35 @@ class Request<T> {
       decoder: decoder,
     );
   }
+
+  Request copyWith({
+    required Uri url,
+    required String method,
+    required Map<String, String> headers,
+    Stream<List<int>>? bodyBytes,
+    bool followRedirects = true,
+    int maxRedirects = 4,
+    int? contentLength,
+    FormData? files,
+    bool persistentConnection = true,
+    Decoder<T>? decoder,
+  }) {
+    if (followRedirects) {
+      assert(maxRedirects > 0);
+    }
+    return Request._(
+      url: url,
+      method: method,
+      bodyBytes: bodyBytes ??= BodyBytesStream.fromBytes(const []),
+      headers: Map.from(headers),
+      followRedirects: followRedirects,
+      maxRedirects: maxRedirects,
+      contentLength: contentLength,
+      files: files,
+      persistentConnection: persistentConnection,
+      decoder: decoder,
+    );
+  }
 }
 
 extension BodyBytesStream on Stream<List<int>> {