DefaultDialer returns the dialer specified by the proxy related variables in the environment.

FromURL returns a Dialer given a URL specification and an underlying Dialer for it to make network requests.

NewPerHost returns a PerHost Dialer that directs connections to either defaultDialer or bypass, depending on whether the connection matches one of the configured rules.

RegisterDialerType takes a URL scheme and a function to generate Dialers from a URL with that scheme and a forwarding Dialer.

SOCKS5 returns a Dialer that makes SOCKSv5 connections to the given address with an optional username and password.

Direct is a direct proxy: one that makes network connections directly.

Auth contains authentication parameters that specific Dialers may require.

A PerHost directs connections to a default Dailer unless the hostname requested matches one of a number of exceptions.

A Dialer is a means to establish a connection.