fix(frontend): use grpc base path

Author: malinskibeniamin

frontend/src/app.test.tsx

@@ -0,0 +1,112 @@
+/**
+ * Copyright 2026 Redpanda Data, Inc.
+ *
+ * Use of this software is governed by the Business Source License
+ * included in the file https://github.com/redpanda-data/redpanda/blob/dev/licenses/bsl.md
+ *
+ * As of the Change Date specified in that file, in accordance with
+ * the Business Source License, use of this software will be governed
+ * by the Apache License, Version 2.0
+ */
+
+import { createConnectTransport } from '@connectrpc/connect-web';
+
+import { getGrpcBasePath } from './config';
+
+vi.mock('@connectrpc/connect-web', () => ({
+  createConnectTransport: vi.fn(() => ({ kind: 'transport' })),
+}));
+
+vi.mock('./config', () => ({
+  setup: vi.fn(() => vi.fn()),
+  getGrpcBasePath: vi.fn(() => '/redpanda-console'),
+  addBearerTokenInterceptor: vi.fn((next) => async (request: unknown) => await next(request)),
+  checkExpiredLicenseInterceptor: vi.fn((next) => async (request: unknown) => await next(request)),
+}));
+
+vi.mock('@builder.io/sdk-react', () => ({
+  Content: () => null,
+}));
+
+vi.mock('@connectrpc/connect-query', () => ({
+  TransportProvider: ({ children }: { children: React.ReactNode }) => children,
+}));
+
+vi.mock('@redpanda-data/ui', () => ({
+  ChakraProvider: ({ children }: { children: React.ReactNode }) => children,
+  redpandaToastOptions: {},
+}));
+
+vi.mock('@tanstack/react-query', () => ({
+  QueryClientProvider: ({ children }: { children: React.ReactNode }) => children,
+}));
+
+vi.mock('@tanstack/react-query-devtools', () => ({
+  ReactQueryDevtools: () => null,
+}));
+
+vi.mock('@tanstack/react-router', () => ({
+  createRouter: vi.fn(() => ({})),
+  RouterProvider: () => null,
+}));
+
+vi.mock('components/builder-io/builder-custom-components', () => ({
+  builderCustomComponents: [],
+}));
+
+vi.mock('components/constants', () => ({
+  BUILDER_API_KEY: 'test-key',
+}));
+
+vi.mock('custom-feature-flag-provider', () => ({
+  CustomFeatureFlagProvider: ({ children }: { children: React.ReactNode }) => children,
+}));
+
+vi.mock('hooks/use-developer-view', () => ({
+  default: () => false,
+}));
+
+vi.mock('protobuf-registry', () => ({
+  protobufRegistry: {},
+}));
+
+vi.mock('query-client', () => ({
+  default: {},
+}));
+
+vi.mock('utils/env', () => ({
+  getBasePath: () => '/redpanda-console',
+}));
+
+vi.mock('utils/redpanda-theme', () => ({
+  patchedRedpandaTheme: {},
+}));
+
+vi.mock('./components/misc/not-found-page', () => ({
+  NotFoundPage: () => null,
+}));
+
+vi.mock('./routeTree.gen', () => ({
+  routeTree: {},
+}));
+
+vi.mock('./state/ui', () => ({
+  installUISettingsSideEffects: vi.fn(() => vi.fn()),
+}));
+
+describe('App dataplane transport', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  test('uses the configured gRPC base path for Connect Query requests', async () => {
+    await import('./app');
+
+    expect(getGrpcBasePath).toHaveBeenCalledWith();
+    expect(createConnectTransport).toHaveBeenCalledWith(
+      expect.objectContaining({
+        baseUrl: '/redpanda-console',
+      })
+    );
+  });
+});

frontend/src/app.tsx

@@ -55,7 +55,7 @@ import { installUISettingsSideEffects } from './state/ui';
 
 // Create transport before router so loaders can use it
 const dataplaneTransport = createConnectTransport({
-  baseUrl: getGrpcBasePath(''), // Embedded mode handles the path separately.
+  baseUrl: getGrpcBasePath(),
   interceptors: [addBearerTokenInterceptor, checkExpiredLicenseInterceptor],
   jsonOptions: {
     registry: protobufRegistry,