public override void OnAuthorization(HttpActionContext actionContext) { var authHeader = actionContext.Request.Headers.Authorization; if (authHeader != null) { if (authHeader.Scheme == SCHEME) { var rawCredentials = authHeader.Parameter; if (AuthHelper.CheckCredentials(rawCredentials)) { Thread.CurrentPrincipal = GetClientPrincipal(rawCredentials); ((ApiController)actionContext.ControllerContext.Controller).User = Thread.CurrentPrincipal; return; } } } HandleUnauthorized(actionContext); }