Hi --

I just clicked on an old link to 
http://www.gnu.org/software/diffutils/manual/. Then the web browser 
showed the address http://www.gnu.org/software/diffutils/manual/ and 
marked it "insecure". So I tried 
https://www.gnu.org/software/diffutils/manual/ (with an s) and the 
browser showed that address.

I'm writing to suggest that you might add a redirect from 
http://www.gnu.org/software/diffutils/manual/ to 
https://www.gnu.org/software/diffutils/manual/ so that no one will get 
the "insecure" page.

Thanks --
Jerry Peek

PS: This might be true for other pages at www.gnu.org. I haven't checked.