Network/IISでCORS対応

• https://docs.microsoft.com/en-us/iis/extensions/cors-module/cors-module-configuration-reference#origin-rules
• https://iis.net/downloads/microsoft/iis-cors-module

あたりを参考にCORS拡張をIISにインストールしたあと

 <system.webServer>
       <cors enabled="true" failUnlistedOrigins="true">
           <add origin="*" >
               <allowHeaders allowAllRequestedHeaders="true" />
           </add>
<!--
           <add origin="https://192.168.2.243:8080"
                allowCredentials="true"
                maxAge="120"> 
               <allowHeaders allowAllRequestedHeaders="true" />
               <allowMethods>
                    <add method="GET" />
                    <add method="POST" />
                    <add method="PUT" />
                    <add method="DELETE" />
               </allowMethods>
               <exposeHeaders />
           </add>
-->
       </cors>
 ...
 </system.webServer>

とすればOK.