Should I add canonical links to pages that are redirected?

[hermanok]

Hello!

I am a little confused concerning canonical links. I have several URLs that all access my page, but I redirect them all. A lot of places I am told to redirect them or use canonicals. Other places, I read that I should always use canonicals. What is the right way for me? If I should use canonicals as well as redirects, which links should I do this on? I redirect my pages like this:

http to https:
http://example.com -> https://example.com

www to non-www:
https://www.example.com -> https://example.com

Remove trailing slashes
https://example.com/ -> https://example.com

Would-be 404-requests to index.php?p=$1
https://example.com/home -> https://example.com/index.php?p=home ( show as https://example.com/home )

Example:
http://www.example.com/home/ -> http://www.example.com/home/ -> https://example.com/home/ -> https://example.com/home -> https://example.com/index.php?p=home ( shows as https://example.com/home )

Thank you!

[hermanok]

Ok, thank you!

[Martijn_Scheijbeler]

It seems that in all your cases you should indeed be redirecting them. Only if a page is really using duplicate content then you're going to need a canonical tag.