Argthtjtr

I am trying to make a GET api request with the below C# code but it fails with

System.Net.WebException: The remote server returned an error: (401) Unauthorized.

   at System.Net.WebClient.DownloadDataInternal(Uri address, WebRequest& request)

   at System.Net.WebClient.DownloadString(Uri address)

   at System.Net.WebClient.DownloadString(String address)

   at Rextester.Program.callAPI()

   at Rextester.Program.Main(String args)

Note that the same API request works through postman.

private static void callAPI()

{



    WebClient client = new WebClient();

    client.UseDefaultCredentials = false;            



    System.Net.ServicePointManager.SecurityProtocol = System.Net.SecurityProtocolType.Tls12;



    client.Headers.Add("Authorization", "Basic " + Base64Encode("<id:password>"));            

    client.Headers.Add("Content-Type", "application/json");   

    client.Headers.Add("Environment-Id", "325");



    client.QueryString.Add("query", "%7B%7D");



    string reply = client.DownloadString("https://<server-api-url>");



    Console.WriteLine(reply);

}        





private static string Base64Encode(string plainText)

{

    var plainTextBytes = System.Text.Encoding.UTF8.GetBytes(plainText);

    var encodedS = System.Convert.ToBase64String(plainTextBytes);

    Console.WriteLine(encodedS);

    return encodedS;

}

One more strange fact is that I see the exception printed before the encoded string. It should I think the other way round. The encoded string should be printed before since the method call happens before making the api call.

After getting some guidance from @Panagiotis Kanavos I traced the api calls from Fiddler and understood that the api call was getting redirected (http status code - 307). The C# client is by default configured to not pass the authorization header on a redirect. Hence I got a 401 Unauthorized error.
This was fixed by adding a check for 401 status code and resending the api request with the authorization header.

Thanks @Panagiotis Kanavos for the help