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) + "...");
            }
        }
    }
}

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!

thanks, men.

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

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()
{

}`

THANK YOU MAN!

Thank you very much.

Thank you very much, you saved my day

thankkk youuuu

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!

thanks!

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",

"orderDetails":[
    {

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

}]

}

Appreciated, if you guide me and share sample code

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#)?

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.

Thank you!