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I am trying to write a write a custom message handler, to authencicate my api. I currently stuck on the following error -- BasicAuthHandler.SendAsync(System.Net.Http.HttpRequestMessage, System.Threading.CancellationToken)': no suitable method found to override -- error.

protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)

public class BasicAuthHandler
        private const string BasicAuthResponseHeader = "WWW-Authenticate";
        private const string BasicAuthResponseHeaderValue = "Basic";

        private readonly iUser Repository = new User();

        protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
            AuthenticationHeaderValue authValue = request.Headers.Authorization;

            if (authValue == null || authValue.Scheme != BasicAuthResponseHeaderValue)
                return Unauthorized(request);
            string[] credentials = Encoding.ASCII.GetString(Convert.FromBase64String(authValue.Parameter)).Split(new[] { ':' });
            if (credentials.Length != 2 || string.IsNullOrEmpty(credentials[0]) || string.IsNullOrEmpty(credentials[1]))
                return Unauthorized(request);
            api_login user = Repository.Validate2(credentials[0], credentials[1]);
            if (user == null)
                return Unauthorized(request);
            IPrincipal principal = new GenericPrincipal(new GenericIdentity(user.username, BasicAuthResponseHeaderValue), null);
            Thread.CurrentPrincipal = principal;
            HttpContext.Current.User = principal;

            return base.SendAsync(request, cancellationToken);

Any guidance into where I may be going wrong with this code. Many thanks

1 solution

I can help with the error. Since 'BasicAuthHandler' itself is a base class, there can't be any method to override. If you delete 'override' keyword in the method definition, the error will be cleared. Might have you forgetten to specify a base class for BasicAuthHandler??
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miss786 18-Feb-14 10:35am    
Hi, Thank you for your reply. I have tried removing the 'override' but then I get another error - 'object' does not contain a definition for 'SendAsync' -- error. On the following line:
"return base.SendAsync(request, cancellationToken);"

I am little confuse by, what you mean by "base class", if you don't mind clarifying this.

for example(do you mean something like this):
public User(cdwEntities context) : base(context) {
// ...

Thank you for your help.
Vedat Ozan Oner 18-Feb-14 10:45am    
It is the basic concept of OOD (object oriented design). see this article:
Vedat Ozan Oner 18-Feb-14 10:46am    
you should do something like
public class BasicAuthHandler: BASE_AUTH_HANDLER {

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