Httpclient get call returning statuscode 401 unauthoriszed in C#

See more:

C#

Windows

WebAPI

I'm trying to make a HttpClient Call through C# by adding some headers. The request is working fine by throwing the empty result as expected with 200 status code. But the same is not working in C# code. My code is like below :

<pre>public static Response TestAbcAPICall()
        {
            Response response = new Response();

            try
            {
                var endpoint = "https:/abc.com/path/?script=435&deploy=1&type=vendor&id=9797";

                
                using (var client = new System.Net.Http.HttpClient())
                {
                    client.BaseAddress = new Uri(endpoint);
                    //way - 1 Adding Authorization header

                    var authenticationHeaderValue = new AuthenticationHeaderValue("Authorization", "NLAuth nlauth_account=1249484_SKB1, nlauth_email=restletuser1@org.in, nlauth_signature=Breaths123!, nlauth_role=4444");
                    client.DefaultRequestHeaders.Authorization = authenticationHeaderValue;

                    // Adding contennt-type header
                    client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

                    var getTask = client.GetAsync(endpoint);
                    getTask.Wait();
                    var result = getTask.Result;

                    if (result.IsSuccessStatusCode)
                    {
                        var RESULTS = result.Content.ReadAsStringAsync().Result;
                        //response = JsonConvert.DeserializeObject<Response>(RESULTS);
                        if (response.flag)
                        {
                            response.flag = true;
                        }
                        else
                        {
                            response.flag = false;
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                response.message = ex.Message;
                response.flag = false;
            }

            return response;
        }

What I have tried:

Tried with posting the headers as used in code with

AuthenticationHeaderValue