Here's a micro-nugget. The following Apache config redirects incoming HTTP traffic to the equivalent HTTPS page. Nothing special but I don't spend enough time working on Apache configurations to keep this stuff fresh in my mind so I find it useful to record what I learn in case I need to do it again later.
<virtualhost *:80> RedirectMatch permanent /(.*)$ https://example.com/$1 </virtualhost> <virtualhost *:443> ServerName example.com # config... </virtualhost>