http server supports subscriber

message.go

@@ -0,0 +1,19 @@
+package http
+
+type rpcMessage struct {
+	topic       string
+	contentType string
+	payload     interface{}
+}
+
+func (r *rpcMessage) ContentType() string {
+	return r.contentType
+}
+
+func (r *rpcMessage) Topic() string {
+	return r.topic
+}
+
+func (r *rpcMessage) Payload() interface{} {
+	return r.payload
+}