Switched to wcurl from my own alias. It's neat. curl doesn't pollute $HOME unlike wget.
~/.wget-hsts
You can disable creating this file or change its location by adding a config option to ~/.wgetrc (or using args to wget every time)I think it's for disallowing http when an https connection has previously been established?
https://en.wikipedia.org/wiki/HTTP_Strict_Transport_Security
So if you're wget-ing a file from a server that uses HTTPS and HSTS, but you only specify http:// (or no protocol at all), then the next time you wget from that server, it will automatically change the URL to https://