asp.net - 尚未使用 Web Api Delegatinghandler 分配内部处理程序

Question

我遇到了 WebApi 在我的代码中抛出异常的问题:

public class WebApiAuthenticationHandler : DelegatingHandler
    {
        private const string AuthToken = "AUTH-TOKEN";

        protected override Task<HttpResponseMessage> SendAsync(
            HttpRequestMessage request, CancellationToken cancellationToken)
        {                  
            var requestAuthTokenList = GetRequestAuthTokens(request);
            if (ValidAuthorization(requestAuthTokenList))
            {
                // EXCEPTION is occuring here!....
                return base.SendAsync(request, cancellationToken);
            }

            /*
            ** This will make the whole API protected by the API token.
            ** To only protect parts of the API then mark controllers/methods
            ** with the Authorize attribute and always return this:
            **
            ** return base.SendAsync(request, cancellationToken);
            */
            return Task<HttpResponseMessage>.Factory.StartNew(
                () =>
                {
                    var resp = new HttpResponseMessage(HttpStatusCode.Unauthorized)
                    {
                        Content = new StringContent("Authorization failed")
                    };

                    //var resp = new HttpResponseMessage(HttpStatusCode.Unauthorized);                                                                                   
                    //resp.Headers.Add(SuppressFormsAuthenticationRedirectModule.SuppressFormsHeaderName,"true");
                    return resp;
                });
        }

异常发生在线路上:

base.SendAsync(request, cancellationToken);

我不知道如何解决这个问题。我的路由表中有以下内容:

    routes.MapHttpRoute("NoAuthRequiredApi", "api/auth/", new { Controller = "Auth" });
    routes.MapHttpRoute("DefaultApi", "api/{controller}/{id}", new { id = RouteParameter.Optional }, null, new WebApiAuthenticationHandler());

发生这种情况的路由是 DefaultApi 路由。非常感谢任何帮助......

Answer 1

找到答案 here和一个示例处理程序 here .

您需要设置您希望将请求传递到的 InnerHandler。

只需将其添加到您的构造函数中:

public class WebApiAuthenticationHandler : DelegatingHandler
{
    public WebApiAuthenticationHandler(HttpConfiguration httpConfiguration)
    {
        InnerHandler = new HttpControllerDispatcher(httpConfiguration); 
    }

并在创建新实例时传入对 GlobalConfiguration 的引用:

routes.MapHttpRoute("DefaultApi", "api/{controller}/{id}", new { id = RouteParameter.Optional }, null, WebApiAuthenticationHandler(GlobalConfiguration.Configuration));