Proxy Auto-Configuration (PAC) Syntax Builder & Sandbox Evaluator

Primary Proxy Node

Failover Routing

Direct Bypass Exceptions

Interactive PAC Sandbox URL Evaluator

/**
 * Proxy Auto-Configuration (PAC) Script
 * Generated via AnshuTechy PAC Builder
 */
function FindProxyForURL(url, host) {
  // Convert host to lowercase for consistent matching
  host = host.toLowerCase();

  // 1. Plain hostnames without dots (e.g. "http://intranet/") route direct
  if (isPlainHostName(host)) {
    return "DIRECT";
  }

  // 2. Localhost and loopback interfaces route direct
  if (host === "localhost" || host === "127.0.0.1" || host === "::1") {
    return "DIRECT";
  }

  // 3. Explicit domain wildcard bypass list
  if (shExpMatch(host, "*.internal")) {
    return "DIRECT";
  }
  if (shExpMatch(host, "*.local")) {
    return "DIRECT";
  }
  if (shExpMatch(host, "*.company-dev.net")) {
    return "DIRECT";
  }

  // 4. RFC1918 Private IP Subnets (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16)
  var resolvedIp = dnsResolve(host);
  if (resolvedIp) {
    if (isInNet(resolvedIp, "10.0.0.0", "255.0.0.0") ||
        isInNet(resolvedIp, "172.16.0.0", "255.240.0.0") ||
        isInNet(resolvedIp, "192.168.0.0", "255.255.0.0") ||
        isInNet(resolvedIp, "127.0.0.0", "255.0.0.0")) {
      return "DIRECT";
    }
  }

  // 5. Default corporate gateway proxy with failover
  return "PROXY proxy.corp.internal:8080; DIRECT";
}