What's the proxy URL format to be passed to --proxy option?

[Murilo Opsfelder Araújo]

On Fri, Oct 4, 2013 at 2:31 PM, Kevin Cernekee <cernekee at gmail.com> wrote:
[...]
> This uses internal_parse_url(), which doesn't currently support the
> "user:password@" syntax.
>
> So this works (sort of):
>
> $ openconnect --proxy http://localhost:3128 vpn.uci.edu
> Attempting to connect to proxy 127.0.0.1:3128
> Requesting HTTP proxy connection to vpn.uci.edu:443
> Unexpected continuation line after CONNECT response: 'Proxy-agent:
> tinyproxy/1.8.3'
> SSL negotiation with vpn.uci.edu
> Connected to HTTPS on vpn.uci.edu
> POST https://vpn.uci.edu/
> XML POST enabled
> GROUP: [Default-WebVPN|Merage|MerageFull|UCI|UCIFull]:^C

How do I authenticate at the proxy server?  Is it possible?

-- 
Murilo