webapi接口跨域访问

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js调用发布的webapi存在跨域问题，一直返回405状态码，我在后台的webconfig文件的<system.webServer>  </system.webServer>节点下加了允许所有人访问

<httpProtocol>
      <customHeaders>
        <add name="Access-Control-Allow-Origin" value="*" />
        <add name="Access-Control-Max-Age" value="30" />
        <add name="Access-Control-Allow-Methods" value="GET,POST,OPTIONS" />
        <add name="Access-Control-Allow-Headers" value="Content-Type, Accept" />
      </customHeaders>
    </httpProtocol>

但是还是访问返回405

解决办法：把原有的<handlers>节点注释掉，也就是下面的代码要注释掉

<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>