php curl multi init HTTP 401 Unauthorized - php

Question

I have used a curl single init to issue an HTTP Get and all worked fine.
Now I tried to use a multi init (as I need to get multiple URLs) and I get a 401 message with "This request requires HTTP authentication" on the response to the Get.
Same Curl options where used on both cases.
Here is the code for th multi init and below it the single init function.
protected function _multiQueryRunkeeper($uri, $subscribersInfo,$acceptHeader) {
$curlOptions = array(
CURLOPT_URL => 'https://api.runkeeper.com' . $uri,
CURLOPT_SSL_VERIFYPEER => false,
CURLOPT_RETURNTRANSFER => 1,
CURLOPT_TIMEOUT => 8,
CURLOPT_HTTPAUTH => CURLAUTH_ANY,
CURLOPT_HTTPGET => true
);
$curl_array = array();
$mh = curl_multi_init();
foreach ($subscribersInfo as $i => $subscriber) {
$curl_array[$i] = curl_init();
curl_setopt_array($curl_array[$i],$curlOptions);
curl_setopt($curl_array[$i], CURLOPT_HEADER,
array('Authorization: Bearer '.$subscriber['token'],
'Accept: application/vnd.com.runkeeper.' . $acceptHeader));
curl_multi_add_handle($mh,$curl_array[$i]);
}
$running = NULL;
do {
usleep(10000);
curl_multi_exec($mh,$running);
} while($running > 0);
$subscribersWorkoutFeed = array();
foreach($subscribersInfo as $i => $subscriber)
{
$subscribersWorkoutFeed[$i] = curl_multi_getcontent($curl_array[$i]);
curl_multi_remove_handle($mh, $curl_array[$i]);
}
curl_multi_close($mh);
return $subscribersWorkoutFeed;
}
protected function _singleQueryRunkeeper($uri, $subscriberToken,$acceptHeader) {
try{
// get fitness user's fitness activities from Runkeeper
$this->_curl = isset($this->_curl)? $this->_curl : curl_init();
$curlOptions = array(
CURLOPT_URL => 'https://api.runkeeper.com' . $uri,
CURLOPT_HTTPHEADER => array('Authorization: Bearer '.$subscriberToken,
'Accept: application/vnd.com.runkeeper.' . $acceptHeader),
CURLOPT_SSL_VERIFYPEER => false,
CURLOPT_RETURNTRANSFER => 1,
CURLOPT_TIMEOUT => 8,
CURLOPT_HTTPGET => true
);
curl_setopt_array($this->_curl,$curlOptions);
$response = curl_exec($this->_curl);
if($response == false) {
if (Zend_Registry::isRegistered('logger')) {
$logger = Zend_Registry::get('logger');
$logger->log('Curl error on _singleQueryRunkeeper: '
. curl_error($this->_curl), Zend_Log::INFO);
}
return null;
}
$data = Zend_Json::decode($response);
return($data);
} catch(Exception $e){
if (Zend_Registry::isRegistered('logger')) {
$logger = Zend_Registry::get('logger');
$logger->log('exception occured on getUsersLatestWorkoutsFromRK. Curl error'
. curl_error($this->_curl), Zend_Log::INFO);
}
}
}