web.config.xml

<configuration>
 <system.webServer>
    <rewrite>
      <rules>
        <rule name="HTTP to HTTPS redirect" stopProcessing="true">
          <match url="(.*)" /> <!-- Require SSL must be OFF in the site settings -->
          <conditions>
            <add input="{HTTPS}" pattern="off" ignoreCase="true" />
          </conditions>
          <action type="Redirect" redirectType="Found" url="https://{HTTP_HOST}{REQUEST_URI}" />
        </rule>
      </rules>
    </rewrite>
  </system.webServer>
</configuration>