I have been building links to my website now for a couple of months and have been using http://www.mydomain.com/sub-domain for all my back links but in google my links show as http://www.mydomain.com/sub-domain.html do i need to add a 301 redirect for all my sub domains so i get the link juice from my link building? For example http://www.mydomain.com/sub-domain >301>> http://www.mydomain.com/sub-domain.html ? Or does that only apply to the www. version redirected to the NON www. version of the domain?