PHP Curl Accept-Language: fr => Mais Reponse http : en :-\

$ch = curl_init();
$ua = '"Mozilla/5.0 (Windows NT 10.0; WOW64; rv:49.0) Gecko/20100101 Firefox/49.0"';
$header[0] = "Host: www.exalead.fr";
$header[] = "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
$header[] = "Accept-Language: fr-FR,fr";
$header[] = "Accept-Charset: utf-8";
$header[] = "Connection: keep-alive";
$header[] = "Keep-Alive: 300";
$header[] = "Pragma: no-cache";
$header[] = "Cache-control: no-cache";
curl_setopt($ch, CURLOPT_HTTPPROXYTUNNEL, 1);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT,15);
curl_setopt($ch, CURLOPT_TIMEOUT,30);
curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
curl_setopt($ch, CURLOPT_USERAGENT, $ua);
curl_setopt($ch, CURLOPT_URL, $_url);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_COOKIEJAR, "cookies.txt");
curl_setopt($ch, CURLOPT_COOKIEFILE, "cookies.txt");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$html = curl_exec($ch);
$statut = @curl_getinfo($ch);
//print_r($statut);
curl_close ($ch);
return $html;