http接口訪問正常，https訪問報錯，基礎連接已經關閉: 發送時發生錯誤.

問題日志 ： 基礎連接已經關閉: 發送時發生錯誤。

基礎連接已經關閉: 發送時發生錯誤。 ---> System.IO.IOException: 無法從傳輸連接中讀取數據: 遠程主機強迫關閉了一個現有的連接。。 ---> System.Net.Sockets.SocketException: 遠程主機強迫關閉了一個現有的連接。

WebClient 請求的時候出現 “基礎連接已經關閉: 發送時發生錯誤” 問題，

 

//.net 4.0 設置： ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072;
//.net 4.5 設置： ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

 

附上官方說明

https://docs.microsoft.com/zh-cn/dotnet/api/system.net.securityprotocoltype?view=netframework-4.7.2

 

本以為是服務器問題，沒想到是設置問題

WebClient wc = new WebClient();
wc.Encoding = Encoding.UTF8;
wc.Headers.Add("Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9");
wc.Headers.Add("Content-Type: application/json");
wc.Headers.Add("User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.61 Safari/537.36");
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
result = wc.UploadString(url, "POST", data);

 

或者

var client = new RestClient(url);
client.Timeout = -1;
var request = new RestRequest(Method.POST);
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", data, ParameterType.RequestBody);

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
IRestResponse response = client.Execute(request);
result = response.Content;