Lua

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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Lua

local chilkat = require("chilkat")

local ftp = chilkat.Ftp2.new()

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.http_proxy_hostname = "proxy.example.com"
ftp.http_proxy_port = 8080

-- Proxy authentication, if required.  HttpProxyAuthMethod is "Basic" or "NTLM"; HttpProxyDomain
-- is the Windows domain used for NTLM.
ftp.http_proxy_username = "myProxyLogin"
ftp.http_proxy_password = "myProxyPassword"
ftp.http_proxy_auth_method = "NTLM"
ftp.http_proxy_domain = "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"

local success = ftp:connect()
if not success then
    print(ftp.last_error_text)
    return
end

print("Connected through the HTTP proxy.")

success = ftp:disconnect()
if not success then
    print(ftp.last_error_text)
    return
end