IIS - How to take your website offline for update or maintenance

Place a file called app_offline.htm in the root directory of your website.
IIS will return the contents of this file, along with a HTTP 503 status code for every single request.
This means you can't reference any external resources. Everything you need has to be inline in the page (or on a different server). 
< HTTP/1.1 503 Service Unavailable
< Content-Type: text/html
< Retry-After: 3600
< Server: Microsoft-IIS/10.0
< Date: Sun, 04 Feb 2018 02:04:19 GMT
< Content-Length: 108
<
<html>
<body>
 
We are currently offline for maintenance.
Please check back later.
 
</body>
</html>

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© Richard McGrath