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


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

 User-added image

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();
            HttpResponse res = h.send(req);
            return res.getToString();
Then I receive a message the following message:
 User-added image

I tried using my local machine ip, but is change the error to error http 403, and receive the following message:
User-added image

Could anybody help me?

Thanks a lot.

ShashankShashank (Salesforce Developers) 
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