I am currently working on setting up a wiki farm as a service.
One thing that comes to mind is version upgrades. Rather than upgrade the one MediaWiki instance and therefore all of the sites at once, I would like to be able to do upgrades in stages. One way of doing this is by having a folder per MediaWiki instance, but then the URL would change every time a new version is installed. (I do have pretty URLs set up, but only for "read" mode; other actions still require the normal URL.)
Is there a way, whether through MediaWiki or through web server-level rewrite rules, to be able to sp