title: Webclient / HttpWebRequest with Basic Authentication returns 404 not found for valid URL
body: <p>Edit: I wanted to come back to note that the problem wasn't on my end at all, but rather with with code on the other company's side.</p>
  
  <p>I'm trying to pull up a page using Basic Authentication. I keep getting a 404 Page not found error. I can copy and paste my url into the browser and it works fine (if I'm not logged into their site already it pops up a credential box, otherwise it opens what I want it to open). I must be getting to the right place and authenticating, because I get a 401 (not authenticated error) if I intentially put in a bad username/password and I get an internal server error 500 if I pass it a bad parameter in the query string. I've tried using Webclient and HttpWebRequest both leading to the same 404 not found error. </p>
  
  <p>With Webclient:</p>
  
  <pre><code>string url = "MyValidURLwithQueryString";
  WebClient client = new WebClient();
  String userName = "myusername";
  String passWord = "mypassword";
  string credentials = Convert.ToBase64String(Encoding.ASCII.GetBytes(userName + ":" + passWord));
  client.Headers[HttpRequestHeader.Authorization] = "Basic " + credentials;
  var result = client.DownloadString(url);
  Response.Write(result);
  </code></pre>
  
  <p>With HttpWebRequest</p>
  
  <pre><code>HttpWebRequest request = (HttpWebRequest)WebRequest.Create("MyValidURL");
  string authInfo = "username:password";
  authInfo = Convert.ToBase64String(Encoding.Default.GetBytes(authInfo));
  request.Headers.Add("Authorization", "Basic " + authInfo);
  request.Credentials = new NetworkCredential("username", "password");
  request.Method = WebRequestMethods.Http.Get;
  request.AllowAutoRedirect = true;
  request.Proxy = null;
  HttpWebResponse response = (HttpWebResponse)request.GetResponse();
  Stream stream = response.GetResponseStream();
  StreamReader streamreader = new StreamReader(stream);
  string s = streamreader.ReadToEnd();
  Response.Write(s);
  </code></pre>