Always follow redirects and store cookies between redirects, including for downloads —useful for https://xeiaso.net/blog/2025/anubis (#2264)

lib/providers/source_provider.dart

@@ -510,6 +510,75 @@ HttpClient createHttpClient(bool insecure) {
   return client;
 }
 
+Future<MapEntry<HttpClient, HttpClientResponse>> sourceRequestStreamResponse(
+      String method,
+      String url,
+      Map<String, String>? requestHeaders,
+      Map<String, dynamic> additionalSettings,
+      {bool followRedirects = true,
+      Object? postBody}) async {
+    var currentUrl = Uri.parse(url);
+    var redirectCount = 0;
+    const maxRedirects = 10;
+    List<Cookie> cookies = [];
+    while (redirectCount < maxRedirects) {
+      var httpClient =
+          createHttpClient(additionalSettings['allowInsecure'] == true);
+      var request = await httpClient.openUrl(method, currentUrl);
+      if (requestHeaders != null) {
+        requestHeaders.forEach((key, value) {
+          request.headers.set(key, value);
+        });
+      }
+      request.cookies.addAll(cookies);
+      request.followRedirects = false;
+      if (postBody != null) {
+        request.headers.contentType = ContentType.json;
+        request.write(jsonEncode(postBody));
+      }
+      final response = await request.close();
+
+      if (followRedirects &&
+          (response.statusCode >= 300 && response.statusCode <= 399)) {
+        final location = response.headers.value(HttpHeaders.locationHeader);
+        if (location != null) {
+          currentUrl = Uri.parse(ensureAbsoluteUrl(location, currentUrl));
+          redirectCount++;
+          cookies = response.cookies;
+          httpClient.close();
+          continue;
+        }
+      }
+
+      return MapEntry(httpClient, response);
+    }
+    throw ObtainiumError('Too many redirects ($maxRedirects)');
+  }
+
+  Future<Response> httpClientResponseStreamToFinalResponse(
+      HttpClient httpClient,
+      String method,
+      String url,
+      HttpClientResponse response) async {
+    final bytes =
+        (await response.fold<BytesBuilder>(BytesBuilder(), (b, d) => b..add(d)))
+            .toBytes();
+
+    final headers = <String, String>{};
+    response.headers.forEach((name, values) {
+      headers[name] = values.join(', ');
+    });
+
+    httpClient.close();
+
+    return http.Response.bytes(
+      bytes,
+      response.statusCode,
+      headers: headers,
+      request: http.Request(method, Uri.parse(url)),
+    );
+  }
+
 abstract class AppSource {
   List<String> hosts = [];
   bool hostChanged = false;
@@ -567,64 +636,15 @@ abstract class AppSource {
   Future<Response> sourceRequest(
       String url, Map<String, dynamic> additionalSettings,
       {bool followRedirects = true, Object? postBody}) async {
+    var method = postBody == null ? 'GET' : 'POST';
     var requestHeaders = await getRequestHeaders(additionalSettings);
-
-    if (requestHeaders != null || followRedirects == false) {
-      var method = postBody == null ? 'GET' : 'POST';
-      var currentUrl = url;
-      var redirectCount = 0;
-      const maxRedirects = 10;
-      while (redirectCount < maxRedirects) {
-        var httpClient =
-            createHttpClient(additionalSettings['allowInsecure'] == true);
-        var request = await httpClient.openUrl(method, Uri.parse(currentUrl));
-        if (requestHeaders != null) {
-          requestHeaders.forEach((key, value) {
-            request.headers.set(key, value);
-          });
-        }
-        request.followRedirects = false;
-        if (postBody != null) {
-          request.headers.contentType = ContentType.json;
-          request.write(jsonEncode(postBody));
-        }
-        final response = await request.close();
-
-        if (followRedirects &&
-            (response.statusCode == 301 || response.statusCode == 302)) {
-          final location = response.headers.value(HttpHeaders.locationHeader);
-          if (location != null) {
-            currentUrl = location;
-            redirectCount++;
-            httpClient.close();
-            continue;
-          }
-        }
-
-        final bytes = (await response.fold<BytesBuilder>(
-                BytesBuilder(), (b, d) => b..add(d)))
-            .toBytes();
-
-        final headers = <String, String>{};
-        response.headers.forEach((name, values) {
-          headers[name] = values.join(', ');
-        });
-
-        httpClient.close();
-
-        return http.Response.bytes(
-          bytes,
-          response.statusCode,
-          headers: headers,
-          request: http.Request(method, Uri.parse(url)),
-        );
-      }
-      throw ObtainiumError('Too many redirects ($maxRedirects)');
-    } else {
-      return postBody == null
-          ? http.get(Uri.parse(url))
-          : http.post(Uri.parse(url), body: jsonEncode(postBody));
-    }
+    var streamedResponseAndClient = await sourceRequestStreamResponse(
+        method, url, requestHeaders, additionalSettings);
+    return await httpClientResponseStreamToFinalResponse(
+        streamedResponseAndClient.key,
+        method,
+        url,
+        streamedResponseAndClient.value);
   }
 
   void runOnAddAppInputChange(String inputUrl) {