gfw.js

var domains = {
  "wikipedia.org":1,
  "spotify.com":1
}

var proxy = "SOCKS5 127.0.0.1:1080; SOCKS 127.0.0.1:1080; DIRECT;";

var direct = 'DIRECT;';

function FindProxyForURL(url, host) {
    var lastPos;
    do {
        if (domains.hasOwnProperty(host)) {
            return proxy;
        }
        lastPos = host.indexOf('.') + 1;
        host = host.slice(lastPos);
    } while (lastPos >= 1);
    return direct;
}