sample article message worked.

server.go

@@ -80,8 +80,8 @@ func answerWechatPost(w http.ResponseWriter, r *http.Request) {
 		//reply = buildUploadPicMsg(h.FromUserName, "media_for_test/640x480.jpg")
 		//reply = buildUploadVoiceMsg(h.FromUserName, "media_for_test/music.mp3")
 		//reply = buildVoiceMsg(h.FromUserName, mediaID)
-		//reply = buildSampleMusicMsg(h.FromUserName)
-		reply = buildSampleArticleMsg(h.FromUserName)
+		reply = buildSampleMusicMsg(h.FromUserName)
+		//reply = buildSampleArticleMsg(h.FromUserName)
 	}
 	w.Header().Set("Content-Type", "text/xml; charset=utf-8")
 	fmt.Fprint(w, reply)