in src/Providers/RsaKeyPairCredentialsProvider.php [105:114]
private function filterSTSEndpoint(array $params)
{
if (isset($params['stsEndpoint'])) {
$this->stsEndpoint = $params['stsEndpoint'];
}
if (is_null($this->stsEndpoint) || $this->stsEndpoint === '') {
$this->stsEndpoint = 'sts.ap-northeast-1.aliyuncs.com';
}
}