IIS配置允许跨域后，还是无法跨域，请检查＜handlers＞.net core 跨域

IIS配置允许跨域后，还是无法跨域，提示 index.html:1 Access to XMLHttpRequest at '        XXXX' from origin 'http://127.0.0.1:8080' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.请检查

<system.webServer>
    <httpProtocol>
      <!--跨域配置开始-->
      <customHeaders>
        <add name="Access-Control-Allow-Origin" value="*" />
        <!--支持的http 动作-->
        <add name="Access-Control-Allow-Headers" value="AuthToken, Authorization, Origin, Content-Type, Accept, X-Requested-With" />
        <!--响应头 请按照自己需求添加 这里新加了token这个headers-->
        <add name="Access-Control-Request-Methods" value="GET, POST, PUT, DELETE, OPTIONS" />
        <!--允许请求的http 动作-->
      </customHeaders>
      <!--跨域配置结束-->
    </httpProtocol>
    
    <handlers>
      <remove name="ExtensionlessUrlHandler-Integrated-4.0"/>
      <remove name="OPTIONSVerbHandler"/>
      <remove name="TRACEVerbHandler"/>
      <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler"
        preCondition="integratedMode,runtimeVersionv4.0"/>
    </handlers>

   
  </system.webServer>

关键问题是这两行代码

<remove name="OPTIONSVerbHandler"/> <!--选择动词处理程序-->
<remove name="TRACEVerbHandler"/>  <!--跟踪动词处理程序-->

方式一：直接去掉这两行代码

<system.webServer>
    <httpProtocol>
      <!--跨域配置开始-->
      <customHeaders>
        <add name="Access-Control-Allow-Origin" value="*" />
        <!--支持的http 动作-->
        <add name="Access-Control-Allow-Headers" value="AuthToken, Authorization, Origin, Content-Type, Accept, X-Requested-With" />
        <!--响应头 请按照自己需求添加 这里新加了token这个headers-->
        <add name="Access-Control-Request-Methods" value="GET, POST, PUT, DELETE, OPTIONS" />
        <!--允许请求的http 动作-->
      </customHeaders>
      <!--跨域配置结束-->
    </httpProtocol>
    
    <handlers>
      <remove name="ExtensionlessUrlHandler-Integrated-4.0"/>
      <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler"
        preCondition="integratedMode,runtimeVersionv4.0"/>
    </handlers>

   
  </system.webServer>

方法二：直接取消 handlers

<system.webServer>
    <httpProtocol>
      <!--跨域配置开始-->
      <customHeaders>
        <add name="Access-Control-Allow-Origin" value="*" />
        <!--支持的http 动作-->
        <add name="Access-Control-Allow-Headers" value="AuthToken, Authorization, Origin, Content-Type, Accept, X-Requested-With" />
        <!--响应头 请按照自己需求添加 这里新加了token这个headers-->
        <add name="Access-Control-Request-Methods" value="GET, POST, PUT, DELETE, OPTIONS" />
        <!--允许请求的http 动作-->
      </customHeaders>
      <!--跨域配置结束-->
    </httpProtocol>
    
    <!--
<handlers>
      <remove name="ExtensionlessUrlHandler-Integrated-4.0"/>
      <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler"
        preCondition="integratedMode,runtimeVersionv4.0"/>
    </handlers>
-->

   
  </system.webServer>

其他

IIS的处理程序映射Mapping配置文件路径

C:\Windows\System32\inetsrv\config\applicationHost.config

参考的官方文档地址：

​​https://docs.microsoft.com/en-us/iis/configuration/system.webserver/handlers/add​​