Cross origin error web config

<system.webServer>

  <httpProtocol>

    <customHeaders>

      <add name="Access-Control-Allow-Origin" value="*" />

      <add name="Access-Control-Allow-Headers" value="Content-Type" />

      <add name="Access-Control-Allow-Methods"

           value="GET, POST, PUT, DELETE, OPTIONS" />

    </customHeaders>

  </httpProtocol>

</system.webServer>