title: 401 Unauthorized using Yahoo OAuth
body: <p>My below code returns a 401 Unauthorized error each time at the this point:</p>
  
  <pre><code>HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create("http://query.yahooapis.com/v1/yql?q=select%20fields.value%20from%20social.contacts%20where%20guid%3Dme&amp;diagnostics=false");
  request.Headers.Add(
      "Authorization: OAuth " +
      "realm=\"" + "yahooapis.com" + "\"," +
      "oauth_consumer_key=\"" + ConfigurationManager.AppSettings["yahoo_oauth_consumer_key"] + "\"," +
      "oauth_nonce=\"" + Guid.NewGuid().ToString() + "\"," +
      "oauth_signature_method=\"" + "PLAINTEXT" + "\"," +
      "oauth_timestamp=\"" + ((DateTime.UtcNow.Ticks - new DateTime(1970, 1, 1).Ticks) / (1000 * 10000)).ToString() + "\"," +
      "oauth_token=\"" + accessToken.TokenValue + "\"," +
      "oauth_version=\"1.0" + "\"," +
      "oauth_signature=\"" + ConfigurationManager.AppSettings["yahoo_oauth_signature"] + "%26" + "\""
  );
  StreamReader streamReader = new StreamReader(request.GetResponse().GetResponseStream(), true);
  </code></pre>
  
  <p>And when I step into the code everytime I see all the info is there that Yahoo requests to have in  the header, yet everytime I get this 401.</p>