以前学过IHttpModule实现，这次用到了（.net2013），注册完成后出现如下错误：
An ASP.NET setting has been detected that does not apply in Integrated managed pipeline mode
其实在web.config里面加上如下配置就好了
<configuration>
<system.webServer>
<validation validateIntegratedModeConfiguration="false"/>
</system.webServer>
</configuration>
怕下次找费时间，记下来