Cors Error while using api proxy in checkout ui extensions node template

Shopify Plus
1

I’m trying to make an API call to my Express app from a Checkout UI extension using an API proxy, but I’m still encountering a CORS error.
checkout.jsx -

const response = fetch("https://dev-ravindra.myshopify.com/apps/survey", { 
          method: "POST",
          headers: {
            "Content-Type": "application/json",
            "Access-Control-Allow-Origin": "*", 
          },
          body: JSON.stringify({ surveyResponse: "example" }), 
        });