相关疑难解决方法(0)

在ASP.NET中,FormsAuthenticationModule拦截任何HTTP 401,并返回HTTP 302重定向到登录页面.这对AJAX来说很痛苦,因为你要求json并在html中获取登录页面,但状态代码是HTTP 200.

在ASP.NET Web API中避免这种拦截的方法是什么？

在ASP.NET MVC4中,通过明确结束连接来防止此拦截非常容易:

public class MyMvcAuthFilter:AuthorizeAttribute
{
    protected override void HandleUnauthorizedRequest(AuthorizationContext filterContext)
    {
        if (filterContext.HttpContext.Request.IsAjaxRequest() && !filterContext.IsChildAction)
        {
            filterContext.Result = new HttpStatusCodeResult(401);
            filterContext.HttpContext.Response.StatusCode = 401;
            filterContext.HttpContext.Response.SuppressContent = true;
            filterContext.HttpContext.Response.End();
        }
        else
            base.HandleUnauthorizedRequest(filterContext);
    }
}

但是在ASP.NET Web API中我无法显式结束连接,因此即使我使用此代码,FormsAuthenticationModule也会拦截响应并将重定向发送到登录页面:

public class MyWebApiAuth: AuthorizeAttribute
{
    protected override void HandleUnauthorizedRequest(System.Web.Http.Controllers.HttpActionContext actionContext)
    {
        if(actionContext.Request.Headers.Any(h=>h.Key.Equals("X-Requested-With",StringComparison.OrdinalIgnoreCase)))
        {
            var xhr = actionContext.Request.Headers.Single(h => h.Key.Equals("X-Requested-With", StringComparison.OrdinalIgnoreCase)).Value.First();

            if (xhr.Equals("XMLHttpRequest", StringComparison.OrdinalIgnoreCase))
            {
                // this does not work either
                //throw new HttpResponseException(HttpStatusCode.Unauthorized);

                actionContext.Response = new System.Net.Http.HttpResponseMessage(System.Net.HttpStatusCode.Unauthorized); …