não use o curl.
$context = stream_context_create(array(
'http' => array(
'method' => 'POST',
'header' => 'Content-Type: application/x-www-form-urlencoded',
'content' => http_build_query(array([...])),
'protocol_version' => 1.1,
'timeout' => 10,
'ignore_errors' => true
)
));
$result = file_get_contents('https://example.com/', false, $context);
stream_context_create
funciona igualmente bem.