Делаю пост запрос так :
$przegladarka='Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.61 Safari/537.36';
$data = [
'ddlType' => 'SNO',
'txtSearchString' => '911656258683041',
'btnSubmit' => 'Search',
];
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, '
https://intexcsd.com/iservice/CheckWarranty.aspx');
//curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
//curl_setopt($ch, CURLOPT_HTTPHEADER, array( 'Expect:' ) );
curl_setopt($ch, CURLOPT_USERAGENT, $przegladarka);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($data));
curl_setopt($ch, CURLOPT_COOKIEFILE, dirname(
FILE) . '/asd.txt');
curl_setopt($ch, CURLOPT_COOKIEJAR, dirname(
FILE) . '/asd.txt');
$res = curl_exec($ch);
curl_close($ch);