http://l3tczdiiwoo63iwxty4lhs6p7eaxop5micbn7vbliydgv63x5zrrrfyd.onion/4.0.0/user-manual/config.html
If http_parent is "." , then requests
are not forwarded to another HTTP proxy but are made (HTTP-wise) directly to the web servers, albeit
through a SOCKS proxy. Examples: From the company example.com, direct connections are made to all "internal" domains, but everything outbound goes through their ISP's proxy by way of example.com's corporate SOCKS
4A gateway to the Internet. forward-socks4a / socks-gw.example.com:1080 ...