|Displays redirect location instead of actually redirecting to the target URL
|Introduced in version:||1.3.0|
|Removed in version:||still in use|
|Other settings: Alphabetical | By function|
This appears to help you know when a redirect is happening. If you set this to a value in your LocalSettings.php, then any time a "redirect" happens, you get stopped at the point the redirect begins by ending on a page that simply says "Location: " and after that is the URL that you are being sent to. It does not do the redirect automatically.
$config->get( 'DebugRedirects' ), which occurs in includes/OutputPage.php (at least in MediaWiki 1.28).