Function isIPv4Loopback

lib/helpers/shouldBypassProxy.js:3–8

(host)

const LOOPBACK_HOSTNAMES = new Set(['localhost', '0.0.0.0']);

const isIPv4Loopback = (host) => {
  const parts = host.split('.');
  if (parts.length !== 4) return false;
  if (parts[0] !== '127') return false;
  return parts.every((p) => /^\d+$/.test(p) && Number(p) >= 0 && Number(p) <= 255);
};

const isIPv6ZeroGroup = (group) => /^0{1,4}$/.test(group);