使用Zend的s3库在amazon中创建存储桶时获取错误SignatureDoesNotMatch

Question

使用Zend的s3库在Amazon中创建存储桶时出现以下错误：

AmazonS3 367 SignatureDoesNotMatch。我们计算的请求签名与您提供的签名不匹配。检查您的密钥和签名方法。

以下是代码：

require_once('Zend/Service/Amazon/S3.php');

$awsKey = "XXXXXXXXXXXXXXXXX";
$awsSecretKey = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXxxX";
$bucket  = "my_bucket";

$s3 = new Zend_Service_Amazon_S3($awsKey,$awsSecretKey);

$s3->createBucket($bucket);
$buckets = $s3->getBuckets(); 
foreach ($buckets as $bucket) {
     $list = $s3->getObjectsByBucket($bucket); 
}
$s3->putObject("$bucket/myobject", "somedata");
echo $s3->getObject("$bucket/myobject");