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ارور ای پی آی

سلام کسی میدونه این ارور برای چی هست Access to XMLHttpRequest at 'http://۱۲۷.۰.۰.۱:۸۰۰۰/api/....' from origin 'http://localhost:۳۰۰۰' has been blocked by CORS policy: The value of the 'Access-Control-Allow-Credentials' header in the response is '' which must be 'true' when the request's credentials....