将工作邮递员请求转换为 C# (HttpClient)

Question

Having a hard time converting a successful Postman request to a successful request in C#. Showing my code using HttpClient, but have also tried with PostSharp and HttpRequest. I am using a local pfx certificate file which has a password.

In Postman:

• Added the PFX cert to Client Certificates
• Authorization tab has username and password (Basic Auth)
• Authorization header automatically generates based on above ("Basic <encoded username/password>")
• Body is "{}"
    

Sends successfully (200).

Using 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;
        }

This returns Unauthorized (401). The response text contains "Invalid user name or password."

Any thoughts on what might not be matching up between the two requests?

Answer 1

Have you tried using the Postman code snippets to auto-generate the code? It uses the RESTSharp REST API client library for C#.

Click on the </> icon and choose "C# - RestSharp" and it should give you code.

https://learning.postman.com/docs/sending-requests/generate-code-snippets/