Backward compat hexo's rss feed for hexo in IIS/azure

web.config

<configuration>
  <system.webServer>
    <rewrite>
          <rules>
              <rule name="SpecificRewrite" stopProcessing="true">
                  <match url="^rss$" />
                  <action type="Rewrite" url="public/rss.xml" />
              </rule>
          </rules>
  </system.webServer>
</configuration>