c# - HttpModule 不会在每个请求上都被调用

Question

我在服务器上安装了一个 HTTP 模块。奇怪的是它可以工作，但每隔一段时间它就不会被执行。我有日志记录，在它不起作用的时候，它没有到达记录的代码。我在 IIS 日志或事件查看器中也没有看到任何内容。

    namespace RedirectModule
    {
        public class RedirectModule : System.Web.IHttpModule
        {
            private const string MobileUserAgent = "MobileUserAgentCacheKey";

            private const string 

STRING_TO_FIND = "info/lps";
        private const string STRING_TO_ADD = "/mobile";


        public void Dispose()
        {
            //clean-up code here.
        }

        public void Init(HttpApplication context)
        {          
            context.BeginRequest += context_BeginRequest;
        }
        private static object sync = new object();
        private void context_BeginRequest(object sender, EventArgs e)
        {

            try
            {


                HttpContext context = HttpContext.Current;


                string url = context.Request.Url.ToString().ToLower();

                if (!url.Contains(STRING_TO_FIND) || url.Contains(STRING_TO_FIND + STRING_TO_ADD))
                    return;
                Logger.Current.Log("Starting Redirect Phase");

                if (XmlToValues.IsMobile(context.Request.ServerVariables["HTTP_USER_AGENT"],
                                       GetCachedFile(context, "Settings.xml")))
                {
                    var mobileRedirect = GetRedirectUrl(url, STRING_TO_FIND, STRING_TO_ADD);
                    if (mobileRedirect != null)
                    {
                        Logger.Current.Log("Redirect to Mobile page");
                        context.Response.Redirect(mobileRedirect);

                    }
                }
                Logger.Current.Log("Web Page");
                Logger.Current.Log("End Begin Request");
            }
            catch (Exception ex)
            {
                if (ex is ThreadAbortException)
                    return;

                Logger.Current.LogError(ex);

            }
        }


        public static string GetRedirectUrl(string url, string strToFind, string strToAdd)
        {
            try
            {
                Logger.Current.Log("Get Redirect Url ");
                int idx = url.IndexOf(strToFind) + strToFind.Length;
                return url.Substring(0, idx) + strToAdd + url.Substring(idx);
            }
            catch (Exception ex)
            {

                Logger.Current.LogError(ex);


                return null;
            }
        }



        private XmlNodeList GetCachedFile(HttpContext context, string filePath)
        {
            try
            {
                Logger.Current.Log("GetCachedFile START");
                if (context.Cache[MobileUserAgent] == null)
                {
                    context.Cache[MobileUserAgent] = XmlToValues.GetMobileUserAgents(filePath);
                    Logger.Current.Log("Add Mobile File to Cache");
                }
                return (XmlNodeList)context.Cache[MobileUserAgent];
            }
            catch (Exception ex)
            {
                Logger.Current.LogError(ex);

                return null;
            }
        }

    }
}

和我的 Web.Config:

<?xml version="1.0" encoding="UTF-8"?>
<!--
  For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->
<configuration>


  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true">
      <remove name="RedirectModule" />
      <add name="RedirectModule" type="RedirectModule.RedirectModule, RedirectModule" />


    </modules>
    <handlers>
      <remove name="Redirect" />
    </handlers>
    <validation validateIntegratedModeConfiguration="false"/>
  </system.webServer>
  <system.web>
    <httpModules>
      <add name="RedirectModule" type="RedirectModule.RedirectModule, RedirectModule" />
    </httpModules>
    <compilation debug="true">    
    </compilation>
  </system.web>
</configuration>

附注web.config里的log4net去掉了，嫌麻烦。

这是项目的链接:http://www.sendspace.com/file/w42me5

这是被请求页面的标记，它在一个名为 index.htmnl 的文件中:

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<!-- no cache headers -->
<meta http-equiv="Pragma" content="no-cache">
<meta http-equiv="no-cache">
<meta http-equiv="Expires" content="-1">
<meta http-equiv="Cache-Control" content="no-cache">
<!-- end no cache headers -->
</head>
<body>
MOBILE
</body>
</html>

Answer 1

我有一个类似的问题...尝试在您的网络浏览器中关闭缓存并重试。为了关闭此请求的缓存，您需要修改响应 header 。 Example on modifying caching option