not wait for response in cURL and php

$getpage= site_url().'/wp-json/gic/v1/subscriber';
$c = curl_init($getpage);
curl_setopt($c, CURLOPT_POST, 1);
curl_setopt($c, CURLOPT_POSTFIELDS, $post);
curl_setopt($c, CURLOPT_RETURNTRANSFER, true);
curl_setopt($c, CURLOPT_SSL_VERIFYPEER, false);

curl_setopt($c, CURLOPT_TIMEOUT, 1);
curl_setopt($c, CURLOPT_HEADER, 0);
curl_setopt($c, CURLOPT_RETURNTRANSFER, false);
curl_setopt($c, CURLOPT_FORBID_REUSE, true);
curl_setopt($c, CURLOPT_CONNECTTIMEOUT, 1);
curl_setopt($c, CURLOPT_DNS_CACHE_TIMEOUT, 10);
curl_setopt($c, CURLOPT_FRESH_CONNECT, true);

$html = curl_exec($c);
curl_close($c);