获取上传凭证

{
  "code": 200,
  "msg": "执行成功",
  "data": {
    "uploadToken": "dk2Xhd322ds-ODYNXBq15gHdUAT4N3MKVmEIp2:TIfR96BUJt2qLmunmnIiLYp9VLA=: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",
    "uploadHost": "https://upload.qiniup.com",
    "uploadUrl": "https://upload.qiniup.com/",
    "bucket": "pushplus-img",
    "expiresIn": 600
  }
}