'Exclude add product bottom action in WordPress shopping cart from varnish cache

When press plus bottom for add more than 1 of product to shopping cart on wordpress, Finally product add to cart after one minute, but I see this error:

Request URL: https://12345.com/cart/

Request Method: POST

Status Code: 503 Backend fetch failed

x-requested-with: XMLHttpRequest

in my vcl I add this value but not work:

# The code below makes sure the AJAX "add to cart" function works
   set req.url = regsub(req.url, "add-to-cart=\d+_\d+&", "");

 # Do not cache AJAX requests.
   if (req.http.X-Requested-With == "XMLHttpRequest") {
       return(pass);
   }

 # Post requests will not be cached
   if (req.http.Authorization || req.method == "POST") {
       return (pass);
   }

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'Exclude add product bottom action in WordPress shopping cart from varnish cache

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