fix(core): respect custom Gemini baseUrl from modelProviders

packages/core/src/core/geminiContentGenerator/index.test.ts

@@ -38,4 +38,55 @@ describe('createGeminiContentGenerator', () => {
     expect(GeminiContentGenerator).toHaveBeenCalled();
     expect(generator).toBeDefined();
   });
+
+  it('should pass baseUrl through httpOptions when provided', () => {
+    const config = {
+      model: 'gemini-1.5-flash',
+      apiKey: 'test-key',
+      authType: AuthType.USE_GEMINI,
+      baseUrl: 'https://proxy.example.com/gemini',
+    };
+
+    createGeminiContentGenerator(config, mockConfig);
+
+    expect(GeminiContentGenerator).toHaveBeenCalledWith(
+      expect.objectContaining({
+        httpOptions: expect.objectContaining({
+          headers: expect.objectContaining({
+            'User-Agent': expect.any(String),
+          }),
+          baseUrl: 'https://proxy.example.com/gemini',
+        }),
+      }),
+      config,
+    );
+  });
+
+  it('should keep httpOptions unchanged when baseUrl is missing', () => {
+    const config = {
+      model: 'gemini-1.5-flash',
+      apiKey: 'test-key',
+      authType: AuthType.USE_GEMINI,
+    };
+
+    createGeminiContentGenerator(config, mockConfig);
+
+    expect(GeminiContentGenerator).toHaveBeenCalledWith(
+      expect.objectContaining({
+        httpOptions: expect.objectContaining({
+          headers: expect.objectContaining({
+            'User-Agent': expect.any(String),
+          }),
+        }),
+      }),
+      config,
+    );
+    expect(vi.mocked(GeminiContentGenerator).mock.calls[0]?.[0]).not.toEqual(
+      expect.objectContaining({
+        httpOptions: expect.objectContaining({
+          baseUrl: expect.any(String),
+        }),
+      }),
+    );
+  });
 });

packages/core/src/core/geminiContentGenerator/index.ts

@@ -38,7 +38,12 @@ export function createGeminiContentGenerator(
       'x-gemini-api-privileged-user-id': `${installationId}`,
     };
   }
-  const httpOptions = { headers };
+  const httpOptions = config.baseUrl
+    ? {
+        headers,
+        baseUrl: config.baseUrl,
+      }
+    : { headers };
 
   const geminiContentGenerator = new GeminiContentGenerator(
     {