C# 4.0 使用c语言的googlecloud打印机/注册表接口#

我正在尝试使用c#实现Google云打印机/注册表接口。我得到以下错误：

{  "success": false,  "message": "Proxy ID is required.",  "request": {   "time": "0",   "params": {    "firmware": [     "1"    ],    "model": [     "CAAGB"    ],    "update_url": [     "test url"    ],    "manufacturer": [     "TestManufacturer"    ],    "support_url": [     "test url"    ],    "name": [     "TestPrinter"    ],    "proxy": [     ""    ],    "gcp_version": [     "2.0"    ],    "uuid": [     "uuid123"    ],    "capabilities": [     "{\"version\": \"1.0\"}"    ],    "setup_url": [     "test url"    ]   }  },  "errorCode": 115 } 

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您能否建议如何使用c#使用GCP/注册界面？

可能是代理服务器在您发送请求时未分配代理ID

以下是代理ID的含义：