Node.js 为什么我能'；无法从AmazonS3获取签名的Url？

我想使用Nodejs从亚马逊s3获取签名Url，我构建了我的bucket和IAM，但在我使用postman从我的计算机发送请求后，我总是收到一个回复，回复是：

"e": {
        "message": "Missing credentials in config",
        "errno": "ETIMEDOUT",
        "code": "CredentialsError",
        "syscall": "connect",
        "address": "169.251.165.251",
        "port": 80,
        "time": "2018-08-04T17:20:32.554Z",
        "originalError": {
            "message": "Could not load credentials from any providers",
            "errno": "ETIMEDOUT",
            "code": "CredentialsError",
            "syscall": "connect",
            "address": "169.251.165.251",
            "port": 80,
            "time": "2018-08-04T17:20:32.554Z",
            "originalError": {
                "errno": "ETIMEDOUT",
                "code": "ETIMEDOUT",
                "syscall": "connect",
                "address": "169.251.165.251",
                "port": 80,
                "message": "connect ETIMEDOUT 169.251.165.251:80"
            }
        }
    } 

这是我的nodejs代码：

const s3 = new AWS.S3()
s3.config.update({
  accessKeyId:keys.accessKeyId,
  secretAcccessKey:keys.secretAcccessKey,
  region: 'us-west-2'
});
router.get('/',
passport.authenticate('jwt',{session:false}),
(req,res)=>{
  const key =`${req.user.id}/${uuid()}.jpeg`;
  s3.getSignedUrl(
    'putObject',{
       Bucket:'NameOfBucket',
       ContentType:'jpeg',
       Key:key,
       Expires:1000
    },
   (e,url)=>res.json({e}));
});

---

检查具有accessKeyId和SecretAccessKey的用户是否确实有权访问S3感谢您的回复，我检查用户是否有权访问该bucket。此错误不是权限问题。这表明您用于配置的值有问题。。。也许，它们实际上是空的。始终

“严格使用”。