<init>

The concrete route used by a connection to reach an abstract origin server. When creating a connection the client has many options:

• HTTP proxy: a proxy server may be explicitly configured for the client. Otherwise the proxy selector is used. It may return multiple proxies to attempt.
• IP address: whether connecting directly to an origin server or a proxy, opening a socket requires an IP address. The DNS server may return multiple IP addresses to attempt.

Each route is a specific selection of these options.