azure iis agrega encabezado de respuesta http

Agregue web.config en el directorio de entrada del proyecto

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<system.webServer>
    <httpProtocol>
      <customHeaders>
        <add name="Access-Control-Allow-Methods" value="OPTIONS,POST,GET"/>
        <add name="Access-Control-Allow-Headers" value="x-requested-with,content-type"/>
        <add name="Access-Control-Allow-Origin" value="*" />
      </customHeaders>
    </httpProtocol>
</system.webServer>
</configuration>