好友超过1800,就会发多次, 有时遇到微信返回503错误要怎么解决?

[gclsoft]

    @action async getContats() {
        self.loading = true;
        var auth = await storage.get('auth');
        var me = session.user.User;
        var seq=0;
        var response;
        for (let i=0;i<15;++i){
            var response2 = await axios.get('/cgi-bin/mmwebwx-bin/webwxgetcontact', {
                params: {
                    r: +new Date(),
                    seq: seq,
                    skey: auth.skey
                }
            });
          //  console.log("response2.data.MemberList=",response2.data.MemberList)
            if(i===0){
                response=response2;
            }

            if(response2.data.Seq!=0){
                seq=response2.data.Seq;
                if(i!=0){
                    response.data.MemberList = [ ...response.data.MemberList,...response2.data.MemberList]
                }
            }else{
                if(i!=0){
                    response.data.MemberList = [ ...response.data.MemberList,...response2.data.MemberList]
                }

                break;
            }
        }

       // console.log("response.data.MemberList=",response.data.MemberList)
        // Remove all official account and brand account
        //debugger;
        self.memberList = response.data.MemberList.filter(e => helper.isContact(e) && !helper.isOfficial(e) && !helper.isBrand(e)).concat(me);
        self.memberList.map(e => {
            e.MemberList = [];
            return self.resolveUser(auth, e);
        });