我们经常会写post请求将我们需要传递的参数传递给目标地址端口，最近在写PowerAutomate的http触发流时遇到了这个问题，我对PowerAutomate的触发器URL发送post请求，但没有成功，后端捕获的异常为”基础连接已关闭,发送时发生错误”。这个问题是于安全协议导致的，更换安全协议类型即可。
这个问题是由于安全协议导致的，更换安全协议类型即可。
可用代码如下：
代码语言：javascript复制using System;
using System.IO;
using System.Net;
using System.Text;
//传入目标地址Url和Post的参数jsonParas，返回目标端口的响应返回值
public static string HttpRequestByPost(string Url, string jsonParas) {
//设置服务属性
ServicePointManager.Expect100Continue = true;
ServicePointManager.CheckCertificateRevocationList = true;
ServicePointManager.DefaultConnectionLimit = 100;
ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072;//这里设置了协议类型
ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };
//创建一个HTTP请求
string strURL = Url;
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(strURL);
request.Method = "POST";
request.ContentType = "application/json";
request.Accept = "*/*";
byte[] payload;
string paraUrlCoded = jsonParas;
payload = Encoding.UTF8.GetBytes(paraUrlCoded);
request.ContentLength = payload.Length;
//发送请求，获得请求流
Stream writer;
try {
writer = request.GetRequestStream();
}
catch (Exception) {
writer = null;
Console.Write("连接服务器失败!");
}
writer.Write(payload, 0, payload.Length);
writer.Close();
//获得返回值
HttpWebResponse response;
try {
response = (HttpWebResponse)request.GetResponse();
}
catch (WebException ex) {
response = ex.Response as HttpWebResponse;
}
Stream s = response.GetResponseStream();
StreamReader sRead = new StreamReader(s);
string postContent = sRead.ReadToEnd();
sRead.Close();
return postContent;
}解决问题的核心代码是这段服务属性配置：
代码语言：javascript复制//设置服务属性
ServicePointManager.Expect100Continue = true;
ServicePointManager.CheckCertificateRevocationList = true;
ServicePointManager.DefaultConnectionLimit = 100;
ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072;//这里设置了协议类型
ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };其中协议类型那一行，需要根据.Net的版本进行调整。
代码语言：javascript复制/*.net 4.0 设置：*/
ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072;
/*.net 4.5 设置(只要写SecurityProtocolType能够点出来的属性就可以)：*/
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12|| SecurityProtocolType.Ssl3 || SecurityProtocolType.Tls11 || SecurityProtocolType.Tls;Damon_Liu
Damon, Chinese, Liu Guangzhi, Software development engineer, CSDN quality creator, Ali Cloud expert blogger, Microsoft Technology Associate, Good at C#, Java, PHP, Python, etc, Love sports, Workaholic, Communist.
