Update app.py

app.py

@@ -15,6 +15,14 @@ app.add_middleware(
     allow_headers=["*"],
 )
 
+@app.options("/{rest_of_path:path}")
+async def preflight_handler(request: Request, rest_of_path: str) -> Response:
+    return Response(headers={
+        "Access-Control-Allow-Origin": "*",  # Allows all origins
+        "Access-Control-Allow-Methods": "POST, GET, OPTIONS, PUT, DELETE",  # Specify methods allowed
+        "Access-Control-Allow-Headers": "*",  # Allows all headers
+    })
+
 class Box:
     def __init__(self, length, width, height, quantity, box_type):
         self.length = length