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;
                });
        }

例外情况正在线上发生：

base.SendAsync(request, cancellationToken);

我不知道如何解决这个问题。我的路线表中有以下内容：

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

发生这种情况的路线是DefaultApi路线。任何帮助都非常感谢....

Answer 1

找到答案here和示例处理程序here。

您需要设置希望传递请求的InnerHandler。

只需将其添加到构造函数中：

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

在创建新实例时传递对GlobalConfiguration的引用：

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

Answer 2

有时您应该检查您请求的RESTful Url，如果它确实存在于您的控制器中。我遇到过这种由错误的URL匹配引起的异常。感谢。

尚未使用Web Api Delegatinghandler分配内部处理程序

2 个答案: