it does, 443 still leaks pattens(e.g. packet length and when/how they're sent/received,etc), that GFW can detec and tell if it's a typical 443 or openvpn-over-4

it does, 443 still leaks pattens(e.g. packet length and when/how they're sent/received,etc), that GFW can detec and tell if it's a typical 443 or openvpn-over-443. also 80 has no security at all and I don't know what it can be used for this purpose.