title: Get contacts using Yahoo Contacts API
body: <p>I followed these steps "http://developer.yahoo.com/oauth/guide/oauth-auth-flow.html" and I got oauth token and GUID from authenticated user.
  Now I am trying retrieve all contacts through GUID as I have seen on searchs for web using this url "http://social.yahooapis.com/v1/user/GUID_HERE/contacts" and passing authorization data via headers but I just get this response:</p>
  
  <pre><code>&lt;?xml version='1.0' encoding='UTF-8'?&gt;&lt;yahoo:errorxmlns:yahoo='http://yahooapis.com/v1/base.rng' xml:lang='en-US'&gt;&lt;yahoo:description&gt;Please provide valid credentials. OAuth oauth_problem="signature_invalid", realm="yahooapis.com"&lt;/yahoo:description&gt;&lt;/yahoo:error&gt;&lt;!-- ws129.socdir.sp2.yahoo.com uncompressed/chunked Tue Aug 28 06:22:40 PDT 2012 --&gt;
  </code></pre>
  
  <p>I am performing the request using cURL (PHP) like is written here "http://developer.yahoo.com/oauth/guide/oauth-make-request.html" (I have checked and I am using my consumer secret as ouath_signature):</p>
  
  <pre><code>$header = array(
  'GET http://social.yahooapis.com/v1/user/' . $guid[1] . '/contacts',
  'Authorization: OAuth realm="yahooapis.com", '.
                                       'oauth_consumer_key="'.$yahoo_consumer_key.'", '.
                                       'oauth_nonce="'.uniqid().'", '.
                                       'oauth_signature_method="HMAC-SHA1", '.
                                       'oauth_timestamp="'.time().'", '.
                                       'oauth_token="'.$ouathToken[1].'", '.
                                       'oauth_version="1.0", '.
                                       'oauth_signature="'.$yahoo_consumer_secret.'"');
  curl_setopt_array($ch, array(
      CURLOPT_RETURNTRANSFER =&gt; true,
                CURLOPT_FOLLOWLOCATION =&gt; TRUE,
                CURLOPT_SSL_VERIFYPEER =&gt; false,
                CURLOPT_SSL_VERIFYHOST =&gt; 0,
                //CURLOPT_HTTPGET =&gt; true,
                CURLOPT_URL =&gt; 'http://social.yahooapis.com/v1/user/' . $guid[1] . '/contacts',
                CURLOPT_HTTPHEADER =&gt; $header
      ));
  </code></pre>
  
  <p>Anyone can help?</p>