go-micro transport 通信

　　transport 用于服务之间的通信，自定义了socket接口，封装了Send、Recv、Close接口，可以有HTTP、NATS、RPC等实现，默认使用http

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type Message struct {     Header map[string]string     Body   []byte }   type Socket interface {     Recv(*Message) error     Send(*Message) error     Close() error }   type Client interface {     Socket }   type Listener interface {     Addr() string     Close() error     Accept(func(Socket)) error }   // Transport is an interface which is used for communication between // services. It uses socket send/recv semantics and had various // implementations {HTTP, RabbitMQ, NATS, ...} type Transport interface {     Init(...Option) error     Options() Options     Dial(addr string, opts ...DialOption) (Client, error)     Listen(addr string, opts ...ListenOption) (Listener, error)     String() string }   type Option func(*Options)   type DialOption func(*DialOptions)   type ListenOption func(*ListenOptions)