C# 中的 HttpWebRequest returns 错误，在简单的 php 示例中有效

Question

我有工作的 php 示例，它完成了它的工作，但不能在 .NET 中做同样的事情 - 返回

System.Net.WebException: The request was aborted: Could not create SSL/TLS secure channel. at System.Net.HttpWebRequest.GetRequestStream(TransportContext& context) at System.Net.HttpWebRequest.GetRequestStream() at

php代码：

$curl = curl_init();
$post_fields = "xxxxxx&msg_type=aaa";
$submit_url = "https://ecommerce.........";
Curl_setopt($curl, CURLOPT_SSLVERSION, 1); //0 
curl_setopt($curl, CURLOPT_POSTFIELDS, $post_fields);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, '0');
curl_setopt($curl, CURLOPT_SSLCERT,         getcwd().'/sert.pem');
curl_setopt($curl, CURLOPT_SSLKEYPASSWD,   'XXXXXXXX');
curl_setopt($curl, CURLOPT_URL, $submit_url);
$result = curl_exec($curl);
$info = curl_getinfo($curl);

.NET代码

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
string addr1 = "https://ecommerce......";
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(addr1);

req.Method = "POST"; // Post method
System.Net.ServicePointManager.ServerCertificateValidationCallback =
    delegate
    {
        return true; // **** Always accept
    };

req.KeepAlive = false;
req.ProtocolVersion = HttpVersion.Version10;

//Certificate with private key
string certName = "sss.xxx.ee_5300954_merchant_wp";
string certpwd = "xxxxxxxx";
X509Certificate2 cert = new X509Certificate2(@"c:\xxx\xxx\" + certName + ".pem", certpwd);

req.ServerCertificateValidationCallback =
    delegate
    {
        return true; // **** Always accept
    };

req.ClientCertificates.Add(cert);

//req.PreAuthenticate = false;

string langStr = "";
String XML = "description=xxxx&msg_type=SMS";//reader.ReadToEnd();

byte[] buffer = Encoding.ASCII.GetBytes(XML);
req.ContentLength = buffer.Length;

// Wrap the request stream with a text-based writer

Stream writer = req.GetRequestStream();
writer.Write(buffer, 0, buffer.Length);
writer.Close();

WebResponse rsp = req.GetResponse();
String post_response = "";
using (StreamReader responseStream = new StreamReader(rsp.GetResponseStream()))
{
}

我已经尝试了很多忽略证书错误的变体，或者使用 tls ssl 版本等，但是 none 似乎在工作我已经尝试了很多忽略证书错误的变体，或者使用 tls ssl 版本等sions 等，但 none 似乎有效。

（关于复制建议，我想我已经试过了，none 解决了我的问题）

Answer 1

PHP 要么信任您的服务器端，要么跳过 TLS 验证，这就是它起作用的原因。你如何测试它？ API 是否在您发送请求的同一台机器上？看看这个，也许它会有所帮助，因为错误很不寻常。 https://support.microsoft.com/en-gb/help/980817/fix-a-net-framework-3-5-based-application-becomes-unresponsive-when-a

Answer 2

我不知道为什么，但有时指定正确的 ContentLength 可能会导致此问题。只是删除 req.ContentLength = buffer.Length; 解决了问题。

C# 中的 HttpWebRequest returns 错误，在简单的 php 示例中有效

HttpWebRequest returns error in c#, works in simple php example

.net

c#

system.net.httpwebrequest