proxy.pac

// Powered by proxy.lsong.org
var proxy = [
  { type: 'SOCKS5', proxy: 'gateway.lsong.org:1080' },
  { type: 'SOCKS' , proxy: 'gateway.lsong.org:1080' },
  'DIRECT'
].map(function(p){
  if(typeof p === 'string') return p;
  return [ p.type, p.proxy ].join(' ');
}).join('; ');

var rules = [
  // github
  "github.com",
  "github.io",
  "githubusercontent.com",
  // npmjs.org
  "npmjs.com",
  "en25.com",
  "cdn.optimizely.com",
  // twitter
  "twitter.com",
  "api.twitter.com",
  "twimg.com",
  // facebook
  "facebook.com",
  "facebook.net",
  "fb.com",
  "fb.me",
  "fbcdn.net",
  "fbsbx.com",
  // facebook messager
  "m.me",
  "messenger.com",
  // instagram
  "instagram.com",
  // google
  "goo.gl",
  "google.com",
  "google.com.hk",
  // youtube
  "youtu.be",
  "youtube.com",
  "yt.be",
  "ytimg.com",
  // telegram
  "t.me",
  "telegram.me",
  "telegram.org",
  ".telegramdownload.com",
  // stackoverflow
  "stackoverflow.com"
];

function FindProxyForURL(url, host) {
  for(var i in rules){
    var rule = rules[i];
    if(~url.indexOf(rule)) return proxy;
  }
  return 'DIRECT';
}