Take this and save it to default.htm
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<meta http-equiv="REFRESH" content="0;url=https://info.domain.com/reaction"></HEAD>
Please wait while you are being redirected.
Click<a href="https://website/appfolder">here</a> to go there immediately.
If you want to redirect from unsecure (http) url to a secure (https) url then it is necessary to customize the 403.4 error message text to be the HTML code above.
Do this for IIS by replacing C:\WINDOWS\help\iisHelp\common\401-4.htm with above.
You can revert to the default anytime: