C# REST Api always return 401 status code when i am calling API by HttpClient-CodePudding

I am working with Nasdaq Fund Network Data Service first time. i am calling their one of the API where passing user id,pwd and access key but always getting 401 status code. i am not able to figure out what is wrong in my http call. please some one have a look at the code and tell me where i made the mistake for which i am getting 401 status code instead of right response.

here is my sample code where i could not share actual credentials and access key. giving the code

string url = "sample url";
Uri u = new Uri(url);

string username = "test1";
string password = "test2";
string accessKey = "myaccesskey";

var payload = new Dictionary<string, string>
{
  {"username", username},
  {"password", password},
  { "accessKey", accessKey}
};

string strPayload = JsonConvert.SerializeObject(payload);
//HttpContent c = new StringContent(strPayload, Encoding.UTF8, "application/json");
HttpContent c = new StringContent(strPayload, Encoding.UTF8, "application/x-www-form-urlencoded");

var response = string.Empty;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11;
using (var client = new HttpClient())
{
    HttpRequestMessage request = new HttpRequestMessage
    {
        Method = HttpMethod.Post,
        RequestUri = u,
        Content = c
    };

    var result = client.SendAsync(request).Result;
    if (result.IsSuccessStatusCode)
    {
        response = result.StatusCode.ToString();
    }
}

This Error i am getting

{StatusCode: 401, ReasonPhrase: 'Check Username/Password or Access Key', Version: 1.1, Content: System.Net.Http.StreamContent, Headers: { Pragma: no-cache X-Frame-Options: SAMEORIGIN Cache-Control: no-cache Date: Wed, 10 Aug 2022 11:55:36 GMT Content-Length: 0
Expires: -1 }}

CodePudding user response：

It could be the way you authenticate to the service. One way to confirm is testing by Postman. Testing for it works?

CodePudding user response：

You should add the access token to your Header and not to the Content.

client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);

CodePudding user response：

We would need some more information to be honest. What is the API expecting? It seems like it's expecting FormData and you're sending a JSON string as StringContent.

Try the following:

var url = "https://nfn.nasdaq.com/servicecall/tempsession";
var username = new StringContent("test1");
var password = new StringContent("test2");
var accessKey = new StringContent("myaccesskey");

var formData = new MultipartFormDataContent
                {
                    { username, "username" },
                    { password, "password" },
                    { accessKey, "accessKey" }
                };

using (var client = new HttpClient())
{
    var response = await client.PostAsync(url, formData);

    response.EnsureSuccessStatusCode();
}

CodePudding user response：

Try the following in order to extract the JWT token you receive as a response.

    var url = "https://nfn.nasdaq.com/servicecall/tempsession";

    var formDataDictionary = new Dictionary<string, string>
    {
        { "username", "test1"},
        { "password", "test2"},
        { "accessKey", "myaccesskey"}
    };

    var formData = new FormUrlEncodedContent(formDataDictionary);

    using (var client = new HttpClient())
    {
        var response = await client.PostAsync(url, formData);

        response.EnsureSuccessStatusCode();

        var result = await response.Content.ReadAsStringAsync();

        var responseBody = JObject.Parse(result);
        var accessToken = responseBody["data']"].Value<string>();
    }