PHP - cURL. Error 501 Not Implemented -

i getting error upon submitting post request using curl. far have code:

$login_url = 'http://192.168.1.1/login';  $postarr = array(     'username'=>'username',     'password'=>'password',     'dst' => base_url().'login/home' ); $this->curlpost($login_url, $postarr);    function curlpost($url, $data){         $ch = curl_init();          curl_setopt($ch, curlopt_url,$url);         curl_setopt($ch, curlopt_post, 1);         curl_setopt($ch, curlopt_ssl_verifypeer, false);         curl_setopt($ch, curlopt_postfields, http_build_query($data));         curl_setopt($ch, curlopt_httpheader, array("content-type: application/x-www-form-urlencoded"));           curl_setopt($ch, curlopt_returntransfer, true);          $server_output = curl_exec ($ch);          curl_close ($ch);          echo 'using curl --- '.$url.'<br />';         var_dump($server_output); } 

basically, code should post username , password specific url, unfortunately returning "error 501: not implemented" server wamp. have idea causing issue? thanks