Can www.example.com/node/123 be used as a canonical url? We are sharing some of our content with partners and want to include a canonical reference to the pages on our Drupal site.  

I like the idea of using www.example.com/node/$nid for the simplicity of it, but I don't know whether it is acceptable for a canonical url to be redirected (as is commonly done with clean urls, path_auto, redirect, etc)?
Permanently redirecting the canonical URL is allowed, but discouraged by RFC 6596:


  To better ensure that applications properly handle the canonical link relation, administrators ought to consider the following guidelines:
  
  […]
  
  Avoid designating the target (canonical) as:
  
  […]
  
  The source IRI of a permanent redirect (for HTTP, this refers to 300 and 301 response codes defined in Sections 10.3.1 and 10.3.2 of [RFC2616]