guration>
  <system.webServer>
    <rewrite>
      <rules>
        <rule name="ASP to PHP Gateway" stopProcessing="true">
          <match url="^gateway\.asp$" />
          <action type="Rewrite" url="gateway.php" appendQueryString="true" />
        </rule>
      </rules>
    </rewrite>
  </system.webServer>
</configuration>