server

type Args struct {
	Entry                []interface{}   `yaml:"entry"`
	MaxConcurrentQueries int             `yaml:"max_concurrent_queries"`
	Timeout              uint            `yaml:"timeout"` // (sec) query timeout.
	Server               []*ServerConfig `yaml:"server"`
}

type ServerConfig struct {
	// Protocol: server protocol, can be:
	// "", "udp" -> udp
	// "tcp" -> tcp
	// "dot", "tls" -> dns over tls
	// "doh", "https" -> dns over https (rfc 8844)
	// "http" -> dns over https (rfc 8844) but without tls
	Protocol string `yaml:"protocol"`

	// Addr: server "host:port" addr.
	// Addr cannot be empty.
	Addr string `yaml:"addr"`

	Cert                string `yaml:"cert"`                    // certificate path, used by dot, doh
	Key                 string `yaml:"key"`                     // certificate key path, used by dot, doh
	URLPath             string `yaml:"url_path"`                // used by doh, http. If it's empty, any path will be handled.
	GetUserIPFromHeader string `yaml:"get_user_ip_from_header"` // used by doh, http.

	// Deprecated and will not take effect. Use Args.Timeout instead.
	// TODO: Remove deprecated.
	Timeout     uint `yaml:"timeout"`
	IdleTimeout uint `yaml:"idle_timeout"` // (sec) used by tcp, dot, doh as connection idle timeout.
}