Simple C# .NET 4.5 HTTPClient Request Using Basic Auth and Proxy

SimpleHttpClient.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net.Http;
using System.Net;


namespace HTTP_Test
{
    class program
    {
        static void Main()
        {
            Task t = new Task(HTTP_GET);
            t.Start();
            Console.ReadLine();
        }

        static async void HTTP_GET()
        {
            var TARGETURL = "http://en.wikipedia.org/";

            HttpClientHandler handler = new HttpClientHandler()
            {
                Proxy = new WebProxy("http://127.0.0.1:8888"),
                UseProxy = true,
            };

            Console.WriteLine("GET: + " + TARGETURL);

            // ... Use HttpClient.            
            HttpClient client = new HttpClient(handler);

            var byteArray = Encoding.ASCII.GetBytes("username:password1234");
            client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Basic", Convert.ToBase64String(byteArray));

            HttpResponseMessage response = await client.GetAsync(TARGETURL);
            HttpContent content = response.Content;

            // ... Check Status Code                                
            Console.WriteLine("Response StatusCode: " + (int)response.StatusCode);

            // ... Read the string.
            string result = await content.ReadAsStringAsync();

            // ... Display the result.
            if (result != null &&
            result.Length >= 50)
            {
                Console.WriteLine(result.Substring(0, 50) + "...");
            }
        }
    }
}

Thanks for the code!

👍 Thank you for the code, you saved me time. Take the rest of the day off!

hi, i am new in programmation. i want to connect a HTTP-server with an webbrowser. so the browser shall send an xml-code to the server. then the server modify it and send back to the browser. i have no idea. can everyone help me pleace?

Thank you very much

Oh yeah. Thanks.
That is what I am looking for. Did it in python but my company is big on .NET platform. So I am about to switch that.

Thanks!

thanks . saved a lot of times

Why not use the .Net built-in BasicAuthenticationHeaderValue (also in the System.Net.Http.Headers namespace)? Like this:
client.DefaultRequestHeaders.Authorization = new BasicAuthenticationHeaderValue(username, password);

• where username and password are vars for the actual credentials

@dteemull, I can't reference BasicAuthenticationHeaderValue for some reason in my project that uses .net 4.5

Hi bryanbarnard.

I'm working on making something similar to this. I'm trying to write a class which uses httpclient to invoke an endpoint and gets the response. I would really appreciate if you can explain me what does your logic do. So that I can work on mine taking your code as reference.

Thank You!

Helped me a lot. Thanks!

Thanks

Gracias por ese pedazo de codigo me salvo la tarde!!!

Thanks! This solution works also on raspberry pi 3 with .net Core 2.0 (preview).

This works on Windows, Linux (Ubuntu 16.04-x64) with .net Core 1.1 and 2.0 (preview):

var credentials = new NetworkCredential(user, password);
var handler     = new HttpClientHandler { Credentials = credentials };
var http        = new HttpClient(handler);

On raspberry pi 3 this throws A task was canceled.

The solution in this gist runs "everywhere" 👍

Regarding this line:

Encoding.ASCII.GetBytes("username:password1234");

If I read the standard correctly it is not a requirment that need to be ASCII. So it would be (more) correct to use Encoding.Unicode.GetBytes($"{userName}:{password}");

Do you agree?

Many thanks .Buddy!

@bitbonk That depends on what encoding the server expects. But as long as only ASCII-characters are used in the username/password it will have the same result as Unicode uses the same byte values for all ASCII-characters, good call Unicode consortium.

I created a rudimentary helper-class for basic authentication which takes encoding into account for all string → byte[] operations.

hello ders
it is good
i want to send and receive async with keep a live
help me plz?

Many thanks dude!

Good! Any OAuth1 and OAuth2 extension ?

There is a debate whether HttpClient should be wrapped in using block or statically on the app level. Although it implements IDisposable, it seems that by wrapping it in the using block, you can make your app malfunction and get the SocketException. And as Ankit blogs, the performance test results are much in favor of static initialization of the HttpClient. Be sure to read these blog posts as they can help you be more informed about the correct usage of the HttpClient.
And don’t forget, being modern, HttpClient is exclusive to the .NET 4.5, so you might have trouble using it on some legacy projects.

Wrong usage of the HTTPClient class (in .NET)

In .NET, as Simon Timms described in his article, you have to be careful when using the HTTPClient class.
Continuous instantiation and disposal of the HTTPClient object may create a socket exhaustion on your machine and affect performance.
Consider reusing the HTTPClient object throughout your calls for better performance.

https://aspnetmonsters.com/2016/08/2016-08-27-httpclientwrong/
https://ankitvijay.net/2016/09/25/dispose-httpclient-or-have-a-static-instance/

Hi , I want to call the third party SMS APi call - TransmitSMS from my .net web application that uses framework 4.5. during the call i want to send authorisation , parameter everything. i am new to the programming. can any guys help on this.

I already tried using http client:

i always get the following error :

{StatusCode: 400, ReasonPhrase: 'Bad Request', Version: 1.1, Content: System.Net.Http.StreamContent, Headers:
{
Connection: close
Date: Wed, 04 Apr 2018 12:06:52 GMT
Server: Microsoft-HTTPAPI/2.0
Content-Length: 334
Content-Type: text/html; charset=us-ascii
}}

following is the code i wrote for calling
public string CancelParameters = "message=12&to=6512312312";
public string URL = "http://api.transmitsms.com/send-sms.json";
try
{
HttpClientHandler handler = new HttpClientHandler()
{
Proxy = new WebProxy("http://localhost:53436"),
UseProxy = true,

            };

            HttpClient client = new HttpClient(handler);
            client.BaseAddress = new Uri(URL);
            //WebProxy.GetDefaultProxy();

           
            client.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/json"));
            
            client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Basic", Convert.ToBase64String(System.Text.ASCIIEncoding.ASCII.GetBytes(string.Format("{0}:{1}", "myusername(apikey)", "my password(secret)"))));
            HttpResponseMessage response = client.GetAsync(CancelParameters).Result;
        }
        catch (Exception ex)
        {
            ex.InnerException.ToString();
        }

can anybody please help on this. thanks in advance.

Muchas gracias

Very nice! I was able to intercept HttpClient with Fiddler on port 58888!