HTTP请求入参

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我的入参是这样的：
[
  {
"billNo": "MATS5656676002",
"containerNo": "",
"carrierCode": "MATS"
  },
  {
"billNo": "MATS5656676003",
"containerNo": "",
"carrierCode": "MATS"
  }
]

我配置为

请求后，我看日志上的参数是为：[0][billNo]=MATS5656676002&[0][containerNo]=&[0][carrierCode]=MATS
期望的格式为：

[
  {
"billNo": "MATS5656676002",
"containerNo": "",
"carrierCode": "MATS"
  }
]