The page does not load through a proxy in linux, what should I do?

Question

linux

I tried to use a free proxy on Raspberry Pie (OC Raspbian) from the list like https://free.proxy-sale.com/#
did everything according to the instructions. https://help.ubuntu.ru/wiki/%D0%BF%D1%80%D0%BE%D0%...
But nothing happened. I tried the proxy address on my main computer, it also does not work:
Cannot access the site The web page at https://2ip.ru/ may be temporarily unavailable or permanently moved to a new address.
ERR_TUNNEL_CONNECTION_FAILED

Answer 1

Tried proxy address on my main computer, doesn't work either

Apparently the proxy is no longer available

Answer 2

I figured it out myself, it turns out that only https IPs are suitable for me

Answer 3

Working free proxies: http , socks5 , socks4 I
advise socks4 on port 4145