PHP CURL GET / POST Digest аутентификация

Я использую метод curl для получения данных из REST API. API требует дайджеста аутентификации. Я сделал дайджест аутентификации, но не работает для метода post. Работает нормально для метода GET.

$username = 'username';
$password = 'password';

$method = 'GET';
// $method = 'POST';

//  FOR POST METHOD. API REQUIRE THIS FORMAT
// $fields = array('APIRquestData' => '{"name":"value","name1":["v4","v5"]}');

$url = "http://apiurl/getmethodname";
// $url = "http://apiurl/postmethodname";

$ch = curl_init();
curl_setopt($ch,CURLOPT_URL, $url);
curl_setopt($ch,CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch,CURLOPT_SSL_VERIFYHOST, false);
curl_setopt($ch,CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch,CURLOPT_FOLLOWLOCATION, false);
curl_setopt($ch,CURLOPT_TIMEOUT, 30);
curl_setopt($ch,CURLOPT_CONNECTTIMEOUT, 30);
if($method == 'POST')
{
$fieldsData = http_build_query($fields);
curl_setopt($ch,CURLOPT_POSTFIELDS, $fieldsData);
}

curl_setopt($ch, CURLOPT_HEADER, 1)
$first_response = curl_exec($ch);
$info = curl_getinfo($ch);

preg_match('/WWW-Authenticate: Digest (.*)/', $first_response, $matches);

if(!empty($matches))
{
$auth_header = $matches[1];
$auth_header_array = explode(',', $auth_header);
$parsed = array();

foreach ($auth_header_array as $pair)
{
$vals = explode('=', $pair);
$parsed[trim($vals[0])] = trim($vals[1], '" ');
}

$response_realm     = (isset($parsed['realm'])) ? $parsed['realm'] : "";
$response_nonce     = (isset($parsed['nonce'])) ? $parsed['nonce'] : "";
$response_opaque    = (isset($parsed['opaque'])) ? $parsed['opaque'] : "";

$authenticate1 = md5($username.":".$response_realm.":".$password);
$authenticate2 = md5($method.":".$url);

$authenticate_response = md5($authenticate1.":".$response_nonce.":".$authenticate2);

$request = sprintf('Authorization: Digest username="%s", realm="%s", nonce="%s", opaque="%s", uri="%s", response="%s"',
$username, $response_realm, $response_nonce, $response_opaque, $url, $authenticate_response);

$request_header = array($request);

$ch = curl_init();
curl_setopt($ch,CURLOPT_URL, $url);
curl_setopt($ch,CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch,CURLOPT_SSL_VERIFYHOST, false);
curl_setopt($ch,CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch,CURLOPT_FOLLOWLOCATION, false);
curl_setopt($ch,CURLOPT_TIMEOUT, 30);
curl_setopt($ch,CURLOPT_CONNECTTIMEOUT, 30);

if($method == 'POST')
{
$fieldsData = http_build_query($fields);
curl_setopt($ch,CURLOPT_POSTFIELDS, $fieldsData);
}
curl_setopt($ch, CURLOPT_HTTPHEADER, $request_header);

$result['response']         = curl_exec($ch);
$result['info']             = curl_getinfo ($ch);
$result['info']['errno']    = curl_errno($ch);
$result['info']['errmsg']   = curl_error($ch);
}


/*
I am getting this as response

Array
(
[response] =>

HTTP Status 404 -
type Status report
message
description The requested resource () is not available.
[info] => Array
(
[url] => http://apiurl/postmethodname
[content_type] => text/html;charset=ISO-8859-1
[http_code] => 404
[header_size] => 361
[request_size] => 551
[filetime] => -1
[ssl_verify_result] => 0
[redirect_count] => 0
[total_time] => 0.109
[namelookup_time] => 0
[connect_time] => 0.063
[pretransfer_time] => 0.063
[size_upload] => 114
[size_download] => 956
[speed_download] => 8770
[speed_upload] => 1045
[download_content_length] => 956
[upload_content_length] => 114
[starttransfer_time] => 0.109
[redirect_time] => 0
[redirect_url] =>
[primary_ip] => XXX.X.XX.XX
[certinfo] => Array
(
)

[primary_port] => 80
[local_ip] => XX.XX.XX.XXX
[local_port] => 58850
[errno] => 0
[errmsg] =>
)
)
*/

Ответ говорит, что 404 означает, что URL не найден. Но URL правильный.

cURL Информация 7.40.0

Заранее спасибо.