在C#中很难将一个成功的Postman请求转换为一个成功的请求。显示我使用HttpClient的代码，但也尝试了PostSharp和HttpRequest。我使用的是一个有密码的本地pfx证书文件。
在 Postman ：

• 将PFX证书添加到客户端证书
• “授权”选项卡包含用户名和密码（基本授权）
• 根据上述内容自动生成授权标题（“Basic〈encoded username/password〉”）
• 正文为“{}”

发送成功（200）。
使用HttpClient：

var host = @"https://thehost/service/verb?param1=blah&param2=1111111";
const string certName = @"C:\Key.pfx";
const string userName = "userName";
const string certPassword = "password1";
const string authPassword = "password2";

var handler = new HttpClientHandler();
handler.ClientCertificateOptions = ClientCertificateOption.Manual;

// tried many combinations here
handler.SslProtocols = SslProtocols.Tls | SslProtocols.Tls11 |
                       SslProtocols.Tls12 | SslProtocols.Tls13;

var cert = new X509Certificate2(certName, certPassword);
handler.ClientCertificates.Add(cert);
//not sure if this is needed
handler.ServerCertificateCustomValidationCallback += (message, certificate2, arg3, arg4) => true;
            
var client = new HttpClient(handler);
//not sure if these are needed
client.DefaultRequestHeaders.Clear();
client.DefaultRequestHeaders.ConnectionClose = true;
// added this to both the request and the client. 
// Also tried "*/*" for both
client.DefaultRequestHeaders.Accept.Add(
        new MediaTypeWithQualityHeaderValue("application/json"));
            
var request = new HttpRequestMessage();
request.RequestUri = new Uri(host);
request.Headers.Accept.Add(
        new MediaTypeWithQualityHeaderValue("application/json"));
request.Content = new StringContent("{}", Encoding.UTF8, 
                                     "application/json");
request.Method = HttpMethod.Post;

//basic auth header
var authenticationString = $"{userName}:{authPassword}";
var base64EncodedAuthenticationString = Convert.ToBase64String(Encoding.UTF8.GetBytes(authenticationString));
var authHeader = new AuthenticationHeaderValue("Basic", 
                     base64EncodedAuthenticationString);
request.Headers.Authorization = authHeader;

try
{
   var httpResponseMessage = client.SendAsync(request).ConfigureAwait(false).GetAwaiter().GetResult();
}catch (Exception e){
   Console.WriteLine(e);
   throw;
}

这将返回Unauthorized（401）。响应文本包含“无效的用户名或密码”。
有没有想过这两个请求之间可能不匹配的地方？