Repository: caddyserver/caddy
File: listeners.go (Go)

Code before:
		return ip.IsUnspecified()
	}
	return false
}

func (na NetworkAddress) port() string {
	if na.StartPort == na.EndPort {
		return strconv.FormatUint(uint64(na.StartPort), 10)
	}
	return fmt.Sprintf("%d-%d", na.StartPort, na.EndPort)
}

// String reconstructs the address string for human display.
// The output can be parsed by ParseNetworkAddress(). If the
// address is a unix socket, any non-zero port will be dropped.
func (na NetworkAddress) String() string {
	if na.Network == "tcp" && (na.Host != "" || na.port() != "") {
		na.Network = "" // omit default network value for brevity
	}
	return JoinNetworkAddress(na.Network, na.Host, na.port())
}

// IsUnixNetwork returns true if the netw is a unix network.
func IsUnixNetwork(netw string) bool {
	return netw == "unix" || netw == "unixgram" || netw == "unixpacket" ||
		netw == "unix+h2c" || netw == "unixgram+h2c" || netw == "unixpacket+h2c"
}

// ParseNetworkAddress parses addr into its individual
// components. The input string is expected to be of
// the form "network/host:port-range" where any part is
// optional. The default network, if unspecified, is tcp.
// Port ranges are inclusive.
//
// Network addresses are distinct from URLs and do not
// use URL syntax.
func ParseNetworkAddress(addr string) (NetworkAddress, error) {
	var host, port string
	network, host, port, err := SplitNetworkAddress(addr)
	if err != nil {
		return NetworkAddress{}, err
	}
	if network == "" {
		network = "tcp"
	}
	if IsUnixNetwork(network) {
		return NetworkAddress{
			Network: network,
			Host:    host,
		}, nil
	}

Review comment (suggestion):
I'm not sure how I feel about these... the `+h2c` thing is really a `reverseproxy`-specific thing, I'm not sure we need to have this in `listener.go` :thinking: 

Code after:
		return ip.IsUnspecified()
	}
	return false
}

func (na NetworkAddress) port() string {
	if na.StartPort == na.EndPort {
		return strconv.FormatUint(uint64(na.StartPort), 10)
	}
	return fmt.Sprintf("%d-%d", na.StartPort, na.EndPort)
}

// String reconstructs the address string for human display.
// The output can be parsed by ParseNetworkAddress(). If the
// address is a unix socket, any non-zero port will be dropped.
func (na NetworkAddress) String() string {
	if na.Network == "tcp" && (na.Host != "" || na.port() != "") {
		na.Network = "" // omit default network value for brevity
	}
	return JoinNetworkAddress(na.Network, na.Host, na.port())
}

// IsUnixNetwork returns true if the netw is a unix network.
func IsUnixNetwork(netw string) bool {
	return strings.HasPrefix(netw, "unix")
}

// ParseNetworkAddress parses addr into its individual
// components. The input string is expected to be of
// the form "network/host:port-range" where any part is
// optional. The default network, if unspecified, is tcp.
// Port ranges are inclusive.
//
// Network addresses are distinct from URLs and do not
// use URL syntax.
func ParseNetworkAddress(addr string) (NetworkAddress, error) {
	var host, port string
	network, host, port, err := SplitNetworkAddress(addr)
	if err != nil {
		return NetworkAddress{}, err
	}
	if network == "" {
		network = "tcp"
	}
	if IsUnixNetwork(network) {
		return NetworkAddress{
			Network: network,
			Host:    host,
		}, nil
	}
	var start, end uint64