.htaccess
I still dabble with the occasional .htaccess file, usually because I need to redirect to HTTPS and naked domain to www. I'm writing it down to avoid searching for it repeatedly.
# Redirect to https
RewriteCond %{HTTPS} off
RewriteRule ^(.*)$ https://%{HTTP_HOST}/$1 [L,R=301]
# Redirect to www
RewriteCond %{HTTP_HOST} !^www\. [NC]
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [L,R=301]