判断 protocol取不到

@@ -8,7 +8,7 @@ exports.index = (req, res, next) => {
     let activityId = req.query.act_id || 2023,
         isApp = req.yoho.isApp,
         uid = req.user.uid,
-        protocol = req.protocol;
+        protocol = req.protocol ? req.protocol + ':' : '';
 
     co(function* () {
         let isStudent = yield req.ctx(shareBuyModel).checkStudent(uid);

@@ -44,8 +44,8 @@ module.exports = class extends global.yoho.BaseModel {
                         });
 
                         if (isApp) {
-                            val.detailUrl = protocol + ':' + val.detailUrl +
-                            '&openby:yohobuy={"action":"go.h5","params":{"islogin":"N","url":"' + protocol + ':' +
+                            val.detailUrl = protocol + val.detailUrl +
+                            '&openby:yohobuy={"action":"go.h5","params":{"islogin":"N","url":"' + protocol +
                             val.detailUrl + '","params":{"couponId":"' + val.couponId + '","couponCode":"' +
                             val.couponCode + '"}}}';
                         }