title: Yahoo OAuth on Android - 401 error
body: <p>I'm trying to implement OAuth for Google, Twitter, Yahoo etc. on Android using the signpost libraries. </p>
  
  <p>All of the above work fine, except Yahoo, which gives me a 401 error when trying to retrieve the Request Token. I've tried modifying my callback url to an http one, and even tried Out of Band authentication. </p>
  
  <p>Does anyone have an idea on what I could be doing wrong  ?</p>
  
  <p>My code which requests for the OAuth Request Token using Signpost libraries is pasted below. </p>
  
  <pre><code>private static CommonsHttpOAuthConsumer yahooConsumer = new CommonsHttpOAuthConsumer(
          YAHOO_CONSUMER_KEY, YAHOO_CONSUMER_SECRET);
  private static CommonsHttpOAuthProvider yahooProvider = new CommonsHttpOAuthProvider(
          YAHOO_REQUEST_URL, YAHOO_ACCESS_TOKEN_URL, YAHOO_AUTH_URL); 
  </code></pre>
  
  <p>and </p>
  
  <blockquote>
    <p>String authURL = yahooProvider.retrieveRequestToken(
                                        yahooConsumer,YAHOO_REDIRECT_URL);
                    startWebView(authURL);  </p>
  </blockquote>
  
  <p><strong>EDIT:</strong></p>
  
  <p>Here's the output from the catched Exception : </p>
  
  <blockquote>
    <p>08-21 00:18:10.935: WARN/System.err(3752): oauth.signpost.exception.OAuthNotAuthorizedException: Authorization failed (server replied with a 401). This can happen if the consumer key was not correct or the signatures did not match.
    08-21 00:18:10.945: WARN/System.err(3752):     at oauth.signpost.AbstractOAuthProvider.handleUnexpectedResponse(AbstractOAuthProvider.java:239)
    08-21 00:18:10.945: WARN/System.err(3752):     at oauth.signpost.AbstractOAuthProvider.retrieveToken(AbstractOAuthProvider.java:189)
    08-21 00:18:10.955: WARN/System.err(3752):     at oauth.signpost.AbstractOAuthProvider.retrieveRequestToken(AbstractOAuthProvider.java:69)</p>
  </blockquote>
  
  <p>Thanks,</p>
  
  <p>Abhinav</p>