How to access to server header via fetch from another domain if cors allowed

Question

How to access to server header via fetch from another domain if cors allowed

example

   fetch(item,{method:"GET"}).then((response) => {
                for (let pair of response.headers.entries()) {
                    console.log(pair[0]+ ': '+ pair[1]);
                }
       }

I cannot see server header

updated.I see on header response enter image description here

what i see on response fetch method enter image description here