I try to mirror some site like this:

# httrack <http://onet.pl> -r6 --ext-depth=6 -O ./a "+*"

This website uses redirect (301) to <http://www.onet.pl:80>, httrack just
downloads index.html page with:

HREF="onet.pl/index.html" Page has moved


when I run
# httrack <http://www.onet.pl> -r6 --ext-depth=6 -O ./a "+*"
it mirrors corectly.

How to tell httrack to follow redirects?