嵌套的Parse.Cloud.HttpRequests超时错误

Question

我的云代码中有三种方法，所有方法都调用Parse.Cloud.HttpRequest。所有这些方法，返回一个回调，我正在回调中执行下一个函数。这似乎给了我一个代码124和超时错误。无论如何都要优化这段代码吗？

以下是一个如何调用它们的示例：

findMetroId(latitude,longitude,function(mI){
      mId = mI;
      //first httpRequest
      getArtistId(artist,function(aI){
      //second httpRequest
        id = aI;
        console.log("Testing values in main function: id = " + id + " mId = " + mId);
        compareDates(mId,id,latitude,longitude,function(myLink,status){
        //third httpRequest
          console.log("Is concert near? " + status);
          console.log("User to be Yo'd is " + username);
          if(status === true){
              console.log("Link is " + myLink);
              sendYo(username,myLink);//fourth httpRequest
          }else{
              //No concert is near to user
              sendYo(username,'http://concertalert.parseapp.com/no.html');
          }
        });


      });

    });