URL Rewrite 导致404,500错误

404 file not found，那就是rewrite的rules配的有问题，这里有篇官方文档，读完了就不会犯这种错啦。

https://docs.microsoft.com/en-us/iis/extensions/url-rewrite-module/url-rewrite-module-configuration-reference

500 server internal error，这个其实一般用ASP.NET才会遇到，尤其是MVC。。因为@Html.ActionLink之类的函数，在渲染的时候会和url rewrite冲突，报错为：

Cannot use a leading .. to exit above the top directory.

解决方法也很简单，把类似的函数用html重写下就行了，比如 

<li>@Html.ActionLink("Home", "Index", "Home")</li>

=>

<a href="/Home/Index" class="navbar-brand">Home</a>

还有种情况就是rewrite成功，返回了200，但是却不是自己想要的结果，如果不能正向找到问题，那就把这段配置加到system.webServer节点中去，抓去所有返回200-299的访问，然后访问下网页，再看看生成W3SVC的日志。日志生成后，记得把这段配置删了，不然会非常卡，原因你懂的。

<tracing>
  <traceFailedRequests>
    <remove path="*" />
    <add path="*">
      <traceAreas>
        <add provider="ASP" verbosity="Verbose" />
        <add provider="ASPNET" areas="Infrastructure,Module,Page,AppServices" verbosity="Verbose" />
        <add provider="ISAPI Extension" verbosity="Verbose" />
        <add provider="WWW Server" areas="Rewrite,RequestRouting,Authentication,Security,Filter,StaticFile,CGI,Compression,Cache,RequestNotifications,Module,FastCGI"
       verbosity="Verbose" />
      </traceAreas>
      <failureDefinitions statusCodes="200-299" />
    </add>
  </traceFailedRequests>
</tracing>

下面再来一个抓访问慢的请求发生时的dump文件的配置

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<tracing>
     <traceFailedRequests>
     　　<remove path="*" />
     　　<add path="*" customActionExe="d:\home\site\Diagnostics\procdump.exe" customActionParams="-ma -accepteula %1% d:\home\site\Diagnostics\w3wp_PID_%1%_" customActionTriggerLimit="5"> 
           　　<traceAreas>
                 　　<add provider="ASP" verbosity="Verbose" />
                 　　<add provider="ASPNET" areas="Infrastructure,Module,Page,AppServices" verbosity="Verbose" />
                 　　<add provider="ISAPI Extension" verbosity="Verbose" />
                 　　<add provider="WWW Server" areas="Authentication,Security,Filter,StaticFile,CGI,Compression,Cache,RequestNotifications,Module,FastCGI" verbosity="Verbose" />
           　　</traceAreas>
           　　<failureDefinitions timeTaken="00:00:30"  />
     　　</add>
     </traceFailedRequests></tracing>