proxy.pac

function regExpMatch(url, pattern) {
  try { return new RegExp(pattern).test(url); } catch(ex) { return false; }
}

function FindProxyForURL(url, host) {
    // Important: replace 172.31 below with the proper prefix for your VPC subnet
    if (shExpMatch(url, "*172.31.*")) return "SOCKS5 localhost:8157";
    if (shExpMatch(url, "*saiki.zalan.do*")) return "SOCKS5 localhost:8157";
    if (shExpMatch(url, "*ec2*.amazonaws.com*")) return 'SOCKS5 localhost:8157';
    if (shExpMatch(url, "*.compute.internal*") || shExpMatch(url, "*://compute.internal*")) return 'SOCKS5 localhost:8157';
    if (shExpMatch(url, "*ec2.internal*")) return 'SOCKS5 localhost:8157';
    return 'DIRECT';
}