Could I call a local service from Sales Force? Is this possible?

Hello,

I was trying to call a service .NET from sales that return a string text, I added the remote

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Then I prepared an Apex class

global class MyButton{
      
      WebService static string returnstr() {
            string url = 'http://localhost/ServicePractice/ServicePractice.svc';
            Http h = new Http();
            
            HttpRequest req = new HttpRequest();
            req.setEndpoint(url);
            req.setMethod('GET');
            
            HttpResponse res = h.send(req);
            return res.getToString();
      }
}

Then I receive a message the following message:
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