!!! Overview
[{$pagename}] [Moved Permanently] redirect [HTTP Status Code] indicates that the [resource] requested has been definitively moved to the URL given by the Location headers. 


A [browser] redirects to this page and search engines update their links to the [resource] (in 'SEO-speak', it is said that the 'link-juice' is sent to the new [URL]).

Even if the specification requires the method (and the body) not to be altered when the redirection is performed, not all [User-agents] align with it - you can still find this type of bugged software out there. It is therefore recommended to use the [{$pagename}] only as a response for [HTTP GET] or [HTTP HEAD] methods and to use the [HTTP 308] Permanent Redirect for [HTTP POST] methods instead, as the method change is explicitly prohibited with this status.


[Browsers] will also permanently [cache] a [{$pagename}] redirect. 
This is important in terms of [HTTPS] because it ensures the same request for an insecure URL issued at a later date is sent securely before being sent over the wire.



!! Impact on SEO. 
[{$pagename}] indicates that crawlers should index the content on the page being redirected to, a [HTTP 302] indicates that they shouldn't.  


!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]
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* [#1] - [301 Moved Permanently|https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/301|target='_blank'] - based on information obtained 2018-07-31-