help for cache file location is wrong
According to the help
--hsts-file Set file for HSTS caching. (default: ~/.wget-hsts)
the hsts file should be located in ~/.wget-hsts
but actually it is in ~/.local/share/wget/.wget-hsts
. I find this very confusing. Also with XDG_DATA_HOME
you can't point it to ~/.wget-hsts
because it always appends wget.