C# 如何解决；“基础连接已关闭”；在API中

我有一个下面的json数据。我正在使用“PUT”方法从API传递此json数据。API返回邮递员的响应，但当我从下面的C代码运行此API时，它会显示一条错误消息，即“底层连接已关闭”

请检查以下代码并建议如何解决此问题

Json数据：-

[
  {
    "transaction": {
      "Version": "1.01",
      "TranDtls": {
        "TaxSch": "GST",
        "SupTyp": "EXPWOP",
        "RegRev": "N",
        "EcmGstin": null,
        "IgstOnIntra": null
      },
      "DocDtls": {
        "Typ": "INV",
        "No": "G/E/20-21/0175",
        "Dt": "11/09/2020"
      },
      "SellerDtls": {
        "Gstin": "29AAFCD5862R000",
        "LglNm": "K.H Exports India Private Limited",
        "TrdNm": "K.H Exports India Private Limited (Glove Division)",
        "Addr1": "142/,Trunk Road",
        "Addr2": "Perumugai",
        "Loc": "Via Vellore",
        "Pin": "560037",
        "Stcd": "29",
        "Ph": "04162253164",
        "Em": "edp.kharind@khindia.com"
      },
      "BuyerDtls": {
        "Gstin": "URP",
        "LglNm": "H M FINANCE AB",
        "TrdNm": "H M FINANCE AB",
        "Pos": "96",
        "Addr1": "MASTER SAMUELSGATAN 46 A,  106 38 STOCKHOLM SWEDEN  ",
        "Addr2": null,
        "Loc": "Sweden",
        "Pin": "999999",
        "Stcd": "96",
        "Ph": null,
        "Em": null
      },
      "DispDtls": null,
      "ShipDtls": {
        "Gstin": "URP",
        "LglNm": "LOGIX FZCO",
        "TrdNm": "LOGIX FZCO",
        "Addr1": "PO BOX 261422 PLOT NO. S21515, SOUTH BLOCK JEBEL ALI FREE ZONE DUBAI UNITED ARAB EMIRATES ",
        "Addr2": null,
        "Loc": "United Arab Emirates",
        "Pin": "999999",
        "Stcd": "96"
      },
      "ItemList": [
        {
          "SlNo": "0001",
          "PrdDesc": "FINE LEATHER GLOVES MADE OUT OF SHEEP LEATHER FOR LADIES. ",
          "IsServc": "N",
          "HsnCd": "42032920",
          "Barcde": null,
          "Qty": 10.0,
          "FreeQty": 0.0,
          "Unit": "PR",
          "UnitPrice": 452.50,
          "TotAmt": 4525.00,
          "Discount": 0.0,
          "PreTaxVal": 4525.00,
          "AssAmt": 4525.00,
          "GstRt": 0.0,
          "IgstAmt": 0.0,
          "CgstAmt": 0.0,
          "SgstAmt": 0.0,
          "CesRt": 0.0,
          "CesAmt": 0.0,
          "CesNonAdvlAmt": 0.0,
          "StateCesRt": 0.0,
          "StateCesAmt": 0.0,
          "StateCesNonAdvlAmt": 0.0,
          "OthChrg": 0.0,
          "TotItemVal": 4525.00,
          "OrdLineRef": null,
          "OrgCntry": null,
          "PrdSlNo": null,
          "BchDtls": null,
          "AttribDtls": null
        }
      ],
      "ValDtls": {
        "AssVal": 4525.00,
        "CgstVal": 0.0,
        "SgstVal": 0.0,
        "IgstVal": 0.0,
        "CesVal": 0.0,
        "StCesVal": 0.0,
        "Discount": 0.0,
        "OthChrg": 0.0,
        "RndOffAmt": 0.0,
        "TotInvVal": 4525.00,
        "TotInvValFc": 0.0
      },
      "PayDtls": {
        "Nm": "ABCDE",
        "AccDet": "5697389713210",
        "Mode": "Cash",
        "FininsBr": "SBIN11000",
        "PayTerm": "100",
        "PayInstr": "Gift",
        "CrTrn": "test",
        "DirDr": "test",
        "CrDay": 100,
        "PaidAmt": 10000,
        "PaymtDue": 5000
      }
    }
  }
]

源代码：-

string DATA = JsonConvert.SerializeObject(trans2, Newtonsoft.Json.Formatting.Indented);

        HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://einvoicing.internal.cleartax.co/v2/eInvoice/generate");

        request.Method = "PUT";
        request.Headers.Add("owner_id", "78c6beda-54a2-11ea-b064-0af3f8b02c24");
        request.Headers.Add("gstin", "29AAFCD5862R000");

        request.ContentType = "application/json";
        request.ContentLength = DATA.Length;



        StreamWriter requestWriter = new StreamWriter(request.GetRequestStream(), System.Text.Encoding.ASCII);
        requestWriter.Write(DATA);

        requestWriter.Close();



        try

        {

            WebResponse webResponse = request.GetResponse();

            Stream webStream = webResponse.GetResponseStream();

            StreamReader responseReader = new StreamReader(webStream);

            string response = responseReader.ReadToEnd();

            Console.Out.WriteLine(response);

            responseReader.Close();
        }
catch()
{
}

                           

        

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确保您发布的代码不包含任何身份验证数据，特别是考虑到您也发布了您试图访问的端点

您是否尝试过安装Fiddler2并观察连接情况

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此端点是否希望使用POST方法而不是PUT方法？

否此api仅支持PUT方法