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My Base class:

public class GlobalVariables
       public static HttpClient client = new HttpClient();

       public GlobalVariables()
           client.BaseAddress = new Uri("http://localhost:8080");
           client.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/xml"));

My Controller:

        public ActionResult GetById()
            IEnumerable<StudentViewModel> list;
            HttpResponseMessage response = GlobalVariables.client.GetAsync("/System_Users").Result;
            list = response.Content.ReadAsAsync<IEnumerable<StudentViewModel>>().Result;
            return View(list);

I get the following error:
System.InvalidOperationException: 'An invalid request URI was provided. The request URI must either be an absolute URI or BaseAddress must be set.'

What I have tried:

I have tried adding an @ sign I have also tried adding the full url's in both my base class and controllers
Updated 3-Jan-19 8:41am

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ZainNabi 3-Jan-19 13:14pm    
It does not work still and I get the same error
F-ES Sitecore 3-Jan-19 13:38pm    
So google the error message and go through the search results until you find the answer for your issue.
MadMyche 3-Jan-19 14:15pm    
Which solution did you try?
See article here, it also shows some alternatives to using HttpClient:
A Few Great Ways to Consume RESTful API in C# - Code Maze[^]
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