AuthBasic returns a ProxyAuthorization that implements "Basic" protocol while ignoring realm challenges.

WithConnectionTimeout customizes the underlying net.Dialer.Timeout.

WithDialer allows the customization of the underlying net.Dialer used for establishing TCP connections to the proxy.

WithProxyAuth allows you to add ProxyAuthorization to calls.

WithTls sets the tls.Config to be used (e.g.

HttpTunnel represents a configured HTTP Connect Tunnel dialer.

ProxyAuthorization allows for plugging in arbitrary implementations of the "Proxy-Authorization" handler.