將文件上傳到亞馬遜Web服務器

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我試圖使用亞馬遜網絡服務上傳文件，但我得到這個錯誤，如下圖所示，因爲其中的文件不會被上傳到服務器：將文件上傳到亞馬遜Web服務器

{ 
    "data": "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<Error><Code>AccessDenied</Code><Message>Invalid according to Policy: Policy Condition failed: [\"starts-with\", \"$filename\", \"\"]</Message><RequestId>7A20103396D365B2</RequestId><HostId>xxxxxxxxxxxxxxxxxxxxx</HostId></Error>", 
    "status": 403, 
    "config": { 
     "method": "POST", 
     "transformRequest": [null], 
     "transformResponse": [null], 
     "url": "https://giblib-verification.s3.amazonaws.com/", 
     "data": { 
      "key": "@usc.edu/1466552912155.jpg", 
      "AWSAccessKeyId": "xxxxxxxxxxxxxxxxx", 
      "acl": "private", 
      "policy": "xxxxxxxxxxxxxxxxxxxxxxx", 
      "signature": "xxxxxxxxxxxxxxxxxxxx", 
      "Content-Type": "image/jpeg", 
      "file": "file:///storage/emulated/0/Android/data/com.ionicframework.giblibion719511/cache/1466552912155.jpg" 
     }, 
     "_isDigested": true, 
     "_chunkSize": null, 
     "headers": { 
      "Accept": "application/json, text/plain, */*" 
     }, 
     "_deferred": { 
      "promise": {} 
     } 
    }, 
    "statusText": "Forbidden" 
}

誰能告訴我什麼是禁止403響應的原因？在此先感謝

來源

2016-06-22 Nishanth Seshadri