Route
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.
Functions
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Returns true if this route tunnels HTTPS or HTTP/2 through an HTTP proxy. See RFC 2817, Section 5.2.