js呼叫釋出的webapi存在跨域問題，一直返回405狀態碼，我在後臺的webconfig檔案的<system.webServer>  </system.webServer>節點下加了允許所有人訪問

<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>
 

但是還是訪問返回405

解決辦法：把原有的<handlers>節點註釋掉，也就是下面的程式碼要註釋掉

<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>