HttpClient 不接受授权标头（401 未授权）？

Question

I am creating a Xamarin.Forms mobile app that targets Android with .NET Standard as my code sharing method. Unfortunately the API I'm consuming works in Postman but doesn't work in C# using HttpClient from System.Net.Http.

Postman request works using this header:

I have tried 3 different approaches but they all still return "401 unauthorized". I've also checked the INTERNET permission in my Android Manifest file.

HttpClient.DefaultRequestHeaders.Add("Authorization", "Token e2eeb1aa9f32eb0ekgn353b6fadb772");
HttpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Token", "e2eeb1aa9f32eb0ekgn353b6fadb772");
HttpClient.DefaultRequestHeaders.TryAddWithoutValidation("Authorization", "Token e2eeb1aa9f32eb0ekgn353b6fadb772");

Answer 1

Please make sure your HTTP request URL is correct or not. Sometimes you may need a trailing backslash ( '/' ). If you missed it in HTTP client , will not work but POSTMAN will .

Answer 2

Try setting the header on the HttpRequestMessage :

request.Headers.Authorization = new 
    AuthenticationHeaderValue("Bearer","e2eeb1aa9f32eb0ekgn353b6fadb772");

Answer 3

In my case, was fixed when I set the basic authentication in the AuthenticationHeaderValue.

var authToken = Encoding.ASCII.GetBytes(_UserName + ":" + _Password);
client.DefaultRequestHeaders.Authorization= new AunthenticationHeaderValue("Basic", Convert.ToBase64String(authToken));