$config->httpHosts vs $_SERVER['httpHosts']

[bernhard]

hi

today i came up with a small problem with my multisite setup on my plesk vserver: if i ceate a "subscription" for a domain like example.com i can choose the favourite url (www.example.com or example.com) redirected by a 301. on multisite domains that does not work because they are "domain aliases" where i can't set up the favourite url.

so i tried something like this: https://processwire.com/talk/topic/7705-website-for-german-investment-company/?p=74908 and realised that $config->httpHost returns example.com wheter you are requesting it with or without www whereas $_SERVER['httpHost'] returns the "full" url with or without the www.

is there any reason for that?

i solved it by uncommenting the 2 lines in the .htaccess

  RewriteCond %{HTTP_HOST} !^www\. [NC]
  RewriteRule ^ http://www.%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

what leads me to my second question:

i'm afraid when i upgrade pw some day i could forget to uncomment those 2 lines. is there any best practise or the like for this problem? how do you do that? do you add comments to all the changed lines?