Fix: Use Starlette router.add_route instead of add_api_route

app.py

@@ -544,13 +544,16 @@ with gr.Blocks(
             """Handle GET /api/gradio requests."""
             return HTMLResponse(interactive_ui())
         
+        # Add routes to Gradio's router using Starlette's router
+        # Use Starlette Route objects for compatibility
+        from starlette.routing import Route
+        
         # Add routes to Gradio's router
-        # Use /api prefix to avoid conflicts with Gradio's routes
-        gradio_app.app.add_api_route("/v1/generate", generate_handler, methods=["POST"])
-        gradio_app.app.add_api_route("/api/health", healthcheck_handler, methods=["GET"])
-        gradio_app.app.add_api_route("/api/gradio", gradio_ui_handler, methods=["GET"])
+        gradio_app.app.router.add_route("/v1/generate", generate_handler, methods=["POST"])
+        gradio_app.app.router.add_route("/api/health", healthcheck_handler, methods=["GET"])
+        gradio_app.app.router.add_route("/api/gradio", gradio_ui_handler, methods=["GET"])
         # Also add /gradio for backward compatibility
-        gradio_app.app.add_api_route("/gradio", gradio_ui_handler, methods=["GET"])
+        gradio_app.app.router.add_route("/gradio", gradio_ui_handler, methods=["GET"])
         print("FastAPI routes added successfully to Gradio router")
     except Exception as e:
         print(f"Warning: Could not add FastAPI routes: {e}")