===== Shadowsocks-libev===== 
Install SS with obfs
<code bash>
sudo sh -c 'printf "deb http://deb.debian.org/debian stretch-backports main" > /etc/apt/sources.list.d/stretch-backports.list'
sudo apt update
sudo apt -t stretch-backports install shadowsocks-libev simple-obfs
</code>
Mofify Config file:
<code bash>
vi /etc/shadowsocks-libev/config.json
</code>
Replace the placeholders
<code>
{
    "server":["0.0.0.0"],
    "mode":"tcp_and_udp",
    "server_port":<YOUR_SERVER_PORT>,
    "local_port":1080,
    "password":"<YOUR_PASSWORD>",
    "timeout":60,
    "method":"chacha20-ietf-poly1305",
    "fast_open":true,
    "plugin":"obfs-server",
    "plugin_opts":"obfs=http;t=60;fast-open",
    "nameserver":"<YOUR_DNS>"
}
</code>
Restart SS:
<code bash>
systemctl restart shadowsocks-libev
</code>