title: Call works in Postman but not in C#
body: <p>I am trying to make a call to below URL and it works just fine in Browser (Chrome) and also in Postman, but for some reason, it doesn't work in C#.</p>
  
  <p><strong>Working in browser:</strong><br>
  <a href="http://AJWKBLWT47VR26QWPNFCPJLXC6217F6F@presta.craftingcrow.com/api/categories" rel="nofollow noreferrer">http://AJWKBLWT47VR26QWPNFCPJLXC6217F6F@presta.craftingcrow.com/api/categories</a></p>
  
  <p><strong>Working in Postman:</strong><br>
  <a href="http://AJWKBLWT47VR26QWPNFCPJLXC6217F6F@presta.craftingcrow.com/api/categories" rel="nofollow noreferrer">http://AJWKBLWT47VR26QWPNFCPJLXC6217F6F@presta.craftingcrow.com/api/categories</a></p>
  
  <p><strong>Not working in C# (RestSharp):</strong>  </p>
  
  <pre><code>var client = new RestClient("http://AJWKBLWT47VR26QWPNFCPJLXC6217F6F@presta.craftingcrow.com/api/categories"); 
  var request = new RestRequest(Method.GET);
  request.AddHeader("cache-control", "no-cache");
  request.AddHeader("User-Agent", @"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36");
  IRestResponse response = client.Execute(request);
  </code></pre>
  
  <p><strong>Response:</strong>
  401 Unauthorized<br>
  <a href="https://i.stack.imgur.com/0QysU.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0QysU.png" alt="enter image description here"></a></p>
  
  <p>P.S. If I remove <strong>User-Agent</strong> it still doesn't work. Why am I doing wrong here?</p>