Update app.js

@@ -92,6 +92,7 @@ app.use(compression());
 require('./doraemon/middleware/yoho-session')(app);
 
 app.use((req, res, next) => {
+    logger.info(req.headers);
     req.user = {}; // 全局的用户数据
     req.yoho = {}; // req和res绑定yoho对象，用于传递全局数据, 如req.yoho.channel等
     req.app.locals.wap = app.locals.wap; // zookeper对象赋值