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Created December 23, 2013 19:15
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Simple C# .NET 4.5 HTTPClient Request Using Basic Auth and Proxy
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);
static async void HTTP_GET()
var TARGETURL = "";
HttpClientHandler handler = new HttpClientHandler()
Proxy = new WebProxy(""),
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) + "...");
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dteemull commented Nov 22, 2016

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

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epicstar commented Jan 3, 2017

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

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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!

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Helped me a lot. Thanks!

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

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gfoidl commented Jun 16, 2017

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" 👍

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bitbonk commented Jun 20, 2017

Regarding this line:


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?

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Many thanks .Buddy!

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@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 stringbyte[] operations.

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htn5723 commented Sep 20, 2017

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

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Many thanks dude!

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Good! Any OAuth1 and OAuth2 extension ?

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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.

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syedimraa commented Apr 5, 2018

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 = "";
HttpClientHandler handler = new HttpClientHandler()
Proxy = new WebProxy("http://localhost:53436"),
UseProxy = true,


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

            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)

can anybody please help on this. thanks in advance.

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Muchas gracias

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

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thanks, men.

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God bless you !!
I lost a day yesterday to get done some GET to external API..
Thank you !! :)

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Not sure what gives but for what ever reason creating the task and running it in main with t.start() does nothing. I don't get any errors it just stops when it hits the closing {} of Main(string[] args). The only thing different I added was user input on user name and password and I added an encryption method .

So I have the Main(string[] args then I have the following

` public async Task EncodePass(string password)

        byte[] bytes = Encoding.Unicode.GetBytes(password);
        byte[] inArray = HashAlgorithm.Create("SHA1").ComputeHash(bytes);
        return Convert.ToBase64String(inArray);

Then I have
`static async void HTTP_GET()


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Mskirvk commented Jan 29, 2020


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dogac00 commented Dec 16, 2020

Thank you very much.

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Thank you very much, you saved my day

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thankkk youuuu

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It took me a while to find out how to encode the username and password into the authorization header, your code saved me a lot of trouble, thanks!

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wicky05 commented Mar 16, 2022

Great Work?

Can you guide me

How to handle below json format using C# (with Authentication) - Post Method with Body(Raw)


"CustomerCode": "F101",
"CusReferenceNo": "3",
"StationName": "fsa",
"SalesmanId": "5",
"OrderStatus": "CLS",
"PostingDate": "2021-01-07",


"ItemCode": "100-0001-00002",
"Quantity": "25000.000000",



Appreciated, if you guide me and share sample code

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gnraju20411 commented Jul 21, 2022

Getting trouble with downloading the PFD files from the webpage ("https://www.*******.com/produ/abc.pdf) with user authentication through using C# "HttpClient"
The webpage having some Cookies also
i followed the same as your code.

Please guide me how download through code (C#)?

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Getting trouble with downloading the PFD files from the webpage ("https://www.*******.com/produ/abc.pdf) with user authentication through using C# "HttpClient"
The webpage having some Cookies also
i followed the same as your code.

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Thank you!

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