Dart

Connect to FTP Through an HTTP Proxy

Demonstrates connecting through an HTTP proxy using HttpProxyHostname, HttpProxyPort, HttpProxyUsername, HttpProxyPassword, HttpProxyAuthMethod, and HttpProxyDomain.

Background: Many corporate networks force outbound traffic through an HTTP proxy, which reaches the FTP control connection via the CONNECT method — so the proxy must permit CONNECT to the FTP port. HttpProxyAuthMethod is Basic or NTLM, with HttpProxyDomain supplying the Windows domain for NTLM. This is distinct from a traditional FTP proxy, which speaks FTP itself.

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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  final ftp = CkFtp2();

  ftp.hostname = 'ftp.example.com';
  ftp.username = 'myFtpLogin';

  // The HTTP proxy through which the FTP control connection is made.  Common ports are 8080 and
  // 3128.
  ftp.httpProxyHostname = 'proxy.example.com';
  ftp.httpProxyPort = 8080;

  // Proxy authentication, if required.  HttpProxyAuthMethod is "Basic" or "NTLM"; HttpProxyDomain
  // is the Windows domain used for NTLM.
  ftp.httpProxyUsername = 'myProxyLogin';
  ftp.httpProxyPassword = 'myProxyPassword';
  ftp.httpProxyAuthMethod = 'NTLM';
  ftp.httpProxyDomain = 'CORP';

  // Normally you would not hard-code the password in source.  You should instead obtain it
  // from an interactive prompt, environment variable, or a secrets vault.
  ftp.password = 'myPassword';

  try {
    ftp.connect();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('Connected through the HTTP proxy.');

  try {
    ftp.disconnect();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }
}