if ($curl = curl_init())
{
   curl_setopt($curl, CURLOPT_URL,'http://mysite.com/test');
   curl_setopt($curl, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows; U; Windows NT 5.1; ru; rv:1.9.0.4) Gecko/2008102920 AdCentriaIM/1.7 Firefox/3.6");
   
   $header = array();
   $header[] = 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8';
   $header[] = 'Accept-Charset: Windows-1251,utf-8;q=0.7,*;q=0.7';
   $header[] = 'Accept-Language: ru-ru,ru;q=0.8,en-us;q=0.5,en;q=0.3';
   $header[] = 'Pragma: ';
   curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
   
   curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
   curl_setopt($curl, CURLOPT_POST, true);
   curl_setopt($curl, CURLOPT_POSTFIELDS,'test=ok');
   $out = curl_exec($curl);
   echo $out;
   curl_close($curl);
}

    echo iconv("windows-1251","utf-8", $out);