web.config

<configuration>
  <system.webServer>
        <handlers>
          <!-- indicates that the file is a node.js application to be handled by the 
            iisnode module -->
          <add name="iisnode" path="serve.js" verb="*" modules="iisnode"/>
        </handlers>
        <rewrite>
          <rules>

            <!-- First we consider whether the incoming URL matches a physical file in
              the /public folder -->
            <rule name="StaticContent">
              <action type="Rewrite" url="public{REQUEST_URI}"/>
            </rule>

            <!-- All other URLs are mapped to the Node.js application entry point -->
            <rule name="DynamicContent">
              <conditions>
                <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="True"/>
              </conditions>
              <action type="Rewrite" url="serve.js"/>
            </rule>

          </rules>
        </rewrite>
  </system.webServer>
</configuration>