HttpClient authentication header not getting sent

Question

I\'m trying to use an HttpClient for a third-party service that requires basic HTTP authentication. I am using the AuthenticationHeaderValue. Here

Answer 1

This would also work and you wouldn't have to deal with the base64 string conversions:

var handler = new HttpClientHandler();
handler.Credentials = new System.Net.NetworkCredential("username", "password");
var client = new HttpClient(handler);
...

Answer 2

Actually your problem is with PostAsync- you should use SendAsync. In your code - client.PostAsync(Uri, request.Content); sends only the content the request message headers are not included. The proper way is:

HttpRequestMessage message = new HttpRequestMessage(HttpMethod.Post, url)
{
    Content = content
};
message.Headers.Authorization = new AuthenticationHeaderValue("Basic", credentials);
httpClient.SendAsync(message);

Answer 3

Your code looks like it should work - I remember running into a similar problem setting the Authorization headers and solved by doing a Headers.Add() instead of setting it:

request.Headers.Add("Authorization", "Basic " + Convert.ToBase64String(System.Text.ASCIIEncoding.ASCII.GetBytes(string.Format("{0}:{1}", "username", "password"))));

UPDATE: It looks like when you do a request.Content, not all headers are being reflected in the content object. You can see this by inspecting request.Headers vs request.Content.Headers. One thing you might want to try is to use SendAsync instead of PostAsync. For example:

HttpRequestMessage<RequestType> request = 
     new HttpRequestMessage<RequestType>(
         new RequestType("third-party-vendor-action"),
         MediaTypeHeaderValue.Parse("application/xml"));

request.Headers.Authorization = 
    new AuthenticationHeaderValue(
        "Basic", 
        Convert.ToBase64String(
            System.Text.ASCIIEncoding.ASCII.GetBytes(
                string.Format("{0}:{1}", "username", "password"))));

 request.Method = HttpMethod.Post;
 request.RequestUri = Uri;
 var task = client.SendAsync(request);

 ResponseType response = task.ContinueWith(
     t => 
         { return t.Result.Content.ReadAsAsync<ResponseType>(); })
         .Unwrap().Result;

Answer 4

Try setting the header on the client:

DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", Convert.ToBase64String(Encoding.ASCII.GetBytes(String.Format("{0}:{1}", userName, password))));

This works for me.