title: HttpClient GetStringAsync() throwing an exception
body: <p>I'm working on MediaFire Api for i'm using rest api for authenthecation when i use this url for in Chrome poster and fifefox poster using 'GET' request Response is coming and i implemneted the same trough code to get response but throwing an exception like </p>
  
  <blockquote>
    <p>Specified value has invalid HTTP Header characters.
    Parameter name: name.</p>
  </blockquote>
  
  <pre><code>requestUrl = https://www.mediafire.com/api/1.1/user/get_session_token.php?  email=windowsphone654321@gmail.com&amp;password=123456AaAa&amp;application_id=42403&amp;signature=506fbb1e62c51c20e50425022e3bca7dabfecca3&amp;token_version=2
  HttpClient httpClient = new HttpClient();
  var res = await httpClient.GetStringAsync(requestUrl);
  </code></pre>