拦截对该服务器所有的http请求

<system.webServer>
<modules>
<add name="HttpAuthvalid" type="YGPT.Country.Auth.HttpAuthvalid"/>
</modules>
</system.webServer>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web;
using Newtonsoft.Json;
namespace YGPT.Country.Auth
{
    /// <summary>
    /// 权限验证
    /// </summary>
    public class HttpAuthvalid : System.Web.IHttpModule
    {
        public void Dispose()
        {
            //此处放置清除代码。
        }

        public void Init(HttpApplication context)
        {
            context.AcquireRequestState += new EventHandler(SystemProcess);
        }

        /// <summary>
        /// 系统访问处理 （系统资源加载，权限验证等）
        /// </summary>
        void SystemProcess(object sender, EventArgs e)
        {
            HttpApplication application = (HttpApplication)sender;// 获取应用程序    
            string url = application.Request.Url.AbsolutePath.ToString();// 获取Url
            if (url == "/setToken")//如果是设置令牌
            {
                if (!string.IsNullOrEmpty(application.Context.Request["param"]))
                {
                    HttpCookie cookie = application.Request.Cookies["YGPT_SESSIONID"];
                    if (cookie == null)
                    {
                        cookie = new HttpCookie("YGPT_SESSIONID");
                    }
                    //组合重置cookie 令牌
                    cookie.Value =
                        application.Context.Request["param"] +
                    YGPT.Country.Auth.EncryptDecrypt.AESEncrypt(YGPT.Country.Auth.Config.DesToValue + DateTime.Now.ToString("yyyyMMdd"), Config.DecryptKey);
                    cookie.HttpOnly = true;
                    cookie.Expires = DateTime.Now.AddDays(100);
                    application.Response.AppendCookie(cookie);
                    application.Response.Write("JsonpHandler({\"result\":\"1\"})");//成功
                    application.Response.End();
                    return;
                }
                else
                {
                    application.Response.Write("JsonpHandler({\"result\":\"0\"})");//失败
                    application.Response.End();
                    return;
                }
            }
            if (application.Request.Cookies["YGPT_SESSIONID"] == null || string.IsNullOrEmpty(application.Request.Cookies["YGPT_SESSIONID"].Value))
            {
                application.Response.Redirect(YGPT.Country.Auth.Config.TimeOutUrl);//跳转到超时页面
                application.Response.End();
                return;
            }
            //string PermisWeburl = System.Configuration.ConfigurationManager.AppSettings["PermisWeburl"];
            //string[] pweburls = PermisWeburl.Split(‘,‘);
            //for (int i = 0; i < pweburls.Length; i++)
            //{
            //    if (url.Contains(pweburls[i]))//登录超时 没权限不做验证
            //    {
            //        return;
            //    }
            //}
            if (System.Configuration.ConfigurationManager.AppSettings["workingmode"] != "deve")
            {
                if (url.IndexOf(".aspx") >= 0)//页面权限
                {
                    User myuser = CurrentUser.GetUser();
                    if (myuser.UserID.ToUpper() == "ADMIN")
                    {
                        return;
                    }
                    /*验证页面权限*/
                    YGPT.Country.Auth.SystypeValue sv = new SystypeValue();
                    sv.SysType = Config.SystemType;
                    sv.ValueName = url;
                    if (myuser.PageHandButton.PageCollect.Contains(sv))
                    {
                        ///跳转到无权限页面
                        CurrentUser.Goto_NoPermission();
                    }
                }
                else if (url.IndexOf(".ashx") >= 0)//http请求权限
                {
                    User myuser = CurrentUser.GetUser();
                    application.Response.ContentType = "text/plain";
                    application.Response.Buffer = true;
                    application.Response.ExpiresAbsolute = DateTime.Now.AddDays(-1);
                    application.Response.AddHeader("pragma", "no-cache");
                    application.Response.AddHeader("cache-control", "");
                    application.Response.CacheControl = "no-cache";

                    if (CurrentUser.Userid.ToUpper() == "ADMIN")
                    {
                        return;
                    }
                    //验证请求权限

                    ////数据处理必须包含 req 参数
                    if (string.IsNullOrEmpty(application.Context.Request["req"]))
                    {
                        ///跳转到无权限页面
                        application.Response.Write(JsonConvert.SerializeObject("NoPermission"));
                        application.Response.End();
                    }
                    string UrlAndQu = url + "?req=" + application.Context.Request["req"];

                    YGPT.Country.Auth.SystypeValue sv = new SystypeValue();
                    sv.SysType = Config.SystemType;
                    sv.ValueName = UrlAndQu;
                    if (myuser.PageHandButton.PageCollect.Contains(sv))
                    {
                        ///返回无权限信息
                        application.Response.Write(JsonConvert.SerializeObject("NoPermission"));
                        application.Response.End();
                        return;
                    }
                }
            }
        }

        public void OnLogRequest(Object source, EventArgs e)
        {
            //可以在此放置自定义日志记录逻辑
        }
    }
}