fix: so, the problem can be somewhere else, becasue map is working fine. And we are trying to find where it is ovveriting issue. Modified main.py with some extra rules. Maybe it is helps

main.py

@@ -124,12 +124,33 @@ app = Starlette(
     debug=True,
 )
 
+# Define allowed origins based on environment
+allowed_origins_dev = ["https://localhost:3000"]  # Dev environment
+allowed_origins_prod = [
+    "https://testing.dscrs.site",  # Preview environment
+    "https://testing.discours.io",  # Preview environment
+]
+
+# Add ExceptionHandlerMiddleware
 app.add_middleware(ExceptionHandlerMiddleware)
+
+# Add CORS middleware for "dev" mode
 if "dev" in sys.argv:
+    print("Running in development mode with CORS for localhost.")
     app.add_middleware(
         CORSMiddleware,
-        allow_origins=["https://localhost:3000"],
+        allow_origins=allowed_origins_dev,
         allow_credentials=True,
         allow_methods=["*"],
         allow_headers=["*"],
     )
+else:
+    # Add CORS middleware for production/preview mode
+    print(f"Running in {MODE} mode with CORS for production/preview.")
+    app.add_middleware(
+        CORSMiddleware,
+        allow_origins=allowed_origins_prod,
+        allow_credentials=True,
+        allow_methods=["*"],  # Allow all HTTP methods
+        allow_headers=["*"],  # Allow all headers
+    )