Setting Authorization Header of HttpClient

Question

I have an HttpClient that I am using for a REST API. However I am having trouble setting up the Authorization header. I need to set the header to the token I received from d

Answer 1

Using AuthenticationHeaderValue class of System.Net.Http assembly

public AuthenticationHeaderValue(
    string scheme,
    string parameter
)

we can set or update existing Authorization header for our httpclient like so:

httpclient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", TokenResponse.AccessToken);

Answer 2

I suggest to you:

HttpClient.DefaultRequestHeaders.Add("Authorization", "Bearer <token>");

And then you can use it like that:

var response = await client.GetAsync(url);
if (response.IsSuccessStatusCode)
{
    responseMessage = await response.Content.ReadAsAsync<ResponseMessage>();
}

Answer 3

6 Years later but adding this in case it helps someone.

https://www.codeproject.com/Tips/996401/Authenticate-WebAPIs-with-Basic-and-Windows-Authen

var authenticationBytes = Encoding.ASCII.GetBytes("<username>:<password>");
using (HttpClient confClient = new HttpClient())
{
  confClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", 
         Convert.ToBase64String(authenticationBytes));
  confClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue(Constants.MediaType));  
  HttpResponseMessage message = confClient.GetAsync("<service URI>").Result;
  if (message.IsSuccessStatusCode)
  {
    var inter = message.Content.ReadAsStringAsync();
    List<string> result = JsonConvert.DeserializeObject<List<string>>(inter.Result);
  }
}

Answer 4

If you want to reuse the HttpClient, it is advised to not use the DefaultRequestHeaders as they are used to send with each request.

You could try this:

var requestMessage = new HttpRequestMessage
    {
        Method = HttpMethod.Post,
        Content = new StringContent("...", Encoding.UTF8, "application/json"),
        RequestUri = new Uri("...")
    };

requestMessage.Headers.Authorization = new AuthenticationHeaderValue("Basic", 
    Convert.ToBase64String(System.Text.ASCIIEncoding.ASCII.GetBytes($"{user}:{password}")));

var response = await _httpClient.SendAsync(requestMessage);

Answer 5

static async Task<AccessToken> GetToken()
{
        string clientId = "XXX";
        string clientSecret = "YYY";
        string credentials = String.Format("{0}:{1}", clientId, clientSecret);

        using (var client = new HttpClient())
        {
            client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", Convert.ToBase64String(Encoding.UTF8.GetBytes(credentials)));
            List<KeyValuePair<string, string>> requestData = new List<KeyValuePair<string, string>>();
            requestData.Add(new KeyValuePair<string, string>("grant_type", "client_credentials"));
            FormUrlEncodedContent requestBody = new FormUrlEncodedContent(requestData);
            var request = await client.PostAsync("https://accounts.spotify.com/api/token", requestBody);
            var response = await request.Content.ReadAsStringAsync();
            return JsonConvert.DeserializeObject<AccessToken>(response);
        }
    }

Answer 6

Use Basic Authorization And Json Parameters.

using (HttpClient client = new HttpClient())
                    {
                        var request_json = "your json string";

                        var content = new StringContent(request_json, Encoding.UTF8, "application/json");

                        var authenticationBytes = Encoding.ASCII.GetBytes("YourUsername:YourPassword");

                        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic",
                               Convert.ToBase64String(authenticationBytes));
                        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

                        var result = await client.PostAsync("YourURL", content);

                        var result_string = await result.Content.ReadAsStringAsync();
                    }