shouldBypassProxy function

bool shouldBypassProxy(String urlString, [ String? noProxy ])

Check if a URL should bypass the proxy based on NO_PROXY.

Supports:

• Exact hostname matches (e.g., "localhost")
• Domain suffix matches with leading dot (e.g., ".example.com")
• Wildcard "*" to bypass all
• Port-specific matches (e.g., "example.com:8080")
• IP addresses (e.g., "127.0.0.1")

Implementation

bool shouldBypassProxy(String urlString, [String? noProxy]) {
  noProxy ??= getNoProxy();
  if (noProxy == null || noProxy.isEmpty) return false;

  // Handle wildcard
  if (noProxy == '*') return true;

  try {
    final uri = Uri.parse(urlString);
    final hostname = uri.host.toLowerCase();
    final port = uri.port != 0
        ? '${uri.port}'
        : (uri.scheme == 'https' || uri.scheme == 'wss' ? '443' : '80');
    final hostWithPort = '$hostname:$port';

    // Split by comma or space and trim
    final noProxyList = noProxy
        .split(RegExp(r'[,\s]+'))
        .where((s) => s.isNotEmpty)
        .toList();

    return noProxyList.any((pattern) {
      final p = pattern.toLowerCase().trim();

      // Port-specific match
      if (p.contains(':')) {
        return hostWithPort == p;
      }

      // Domain suffix match
      if (p.startsWith('.')) {
        return hostname == p.substring(1) || hostname.endsWith(p);
      }

      // Exact hostname match
      return hostname == p;
    });
  } catch (_) {
    return false;
  }
}