I visual the ticker and found that
the spot price looks very strangely: it is totally a line with hardly changed, the future price works fine . which I use code like that:
subscribe all ticker and store in a map then put into db.
and I checked the real price use http request: the subscription price I got is not correct.
and i tried to subscribe single symbol, but seems not work:
the result is the same: spot price hardly changed. But the future price, which used the nearly the same method, worked fine.