how to use controllers filters on CI4

Hello.
# thanks for all
# Service corrected and it works
# I understand how to use Config/Filters.php

# For redirect, i'm using a lamp server i.e easyphp and i made an alias of my website and the directory is on another location of easyphp www directory. Thus, call "redirect('ctrl/fct')" create an error. I try "redirect('/')" and i see that it redirects me on www directory of my easyphp server. Does a mean to correct "redirect" or perhaps i write it bad.
With "header()" function i can redirect if necessary, but perhaps a means exists to use "redirect" in my case.