Refit and authorization header

Question

Currently, I am adding an authorization header to my request like this:

File: SomeFile.cs

public interface ITestApi
{
    [Get("/api/test/{id}")]
    Task<string> GetTest([Header("Authorization")] string authorization, int id);

    [Get("/api/tests/")]
    Task<string> GetTests([Header("Authorization")] string authorization);
}

File: SomeOtherFile.cs

var username = "xxx";
var password = "yyy";
var authHeader = "Basic " + Convert.ToBase64String(Encoding.GetEncoding("ISO-8859-1").GetBytes(username + ":" + password));
var baseAddress = "https://my.test.net";
ITestApi myApi = RestService.For<ITestApi>(baseAddress);

int id = 123;
var test= myApi.GetTest(authHeader, id);

var tests = myApi.GetTests(authHeader);

Is there a way to set the authHeader globally so that I don't have to pass it as a parameter to every call? (I am using Refit version 4.6.48). In other words, I'd like to be able to do the calls like this:

var test= myApi.GetTest(id);

var tests = myApi.GetTests();

Answer 1

I found a solution:

[Headers("Authorization: Basic")]
public interface ITestApi
{
    [Get("/api/test/{id}")]
    Task<string> GetTest(int id);

    [Get("/api/tests/")]
    Task<string> GetTests();
}


var username = "xxx";
var password = "yyy";
var authHeader = Convert.ToBase64String(Encoding.GetEncoding("ISO-8859-1").GetBytes(username + ":" + password));
var baseAddress = "https://my.test.net";

var refitSettings = new RefitSettings()
{
    AuthorizationHeaderValueGetter = () => Task.FromResult(authHeader)
};

ITestApi myApi = RestService.For<ITestApi>(baseAddress, refitSettings);

int id = 123;
var test= myApi.GetTest(id);

var tests = myApi.GetTests();

Answer 2

Refit has changed its approach. Now it uses the default .NET HttpHandler

var handler = new AuthHandler(credentials.Username, credentials.Password);
var githubApi = RestService.For<IGithubApi>(new HttpClient(handler)
                {
                    BaseAddress = new Uri("https://api.github.com")
                });


public class AuthHandler : HttpClientHandler
{
    private readonly string _username;
    private readonly string _password;

    public AuthHandler(string username, 
        string password)
    {
        _username = username;
        _password = password;
    }

    protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, 
        CancellationToken cancellationToken)
    {
        request.Headers.Add("User-Agent", "<your user name or app name>");
        request.Headers.Authorization = new AuthenticationHeaderValue("Basic",
            Convert.ToBase64String(ASCIIEncoding.ASCII.GetBytes(
                $"{_username}:{_password}")));

        return await base.SendAsync(request, cancellationToken)
            .ConfigureAwait(false);
    }
}