使用新增的okx接口，登录时调用query_open_orders函数，总是报超时的错误

[BaoChunhui]

登录时会调用query_open_orders函数，总是报错超时，初步debug发现是sign中的msg不对，修改sign函数如下
def sign(self, request: Request) -> Request:
"""signature"""

    now: datetime = datetime.utcnow()
    now = now - timedelta(milliseconds=self.time_offset_ms)
    timestamp: str = now.isoformat("T", "milliseconds") + "Z"


    if request.params:
        path: str = request.path + "?" + urlencode(request.params)
    else:
        path: str = request.path

    if request.data:
        request.data = json.dumps(request.data)
        msg: str = timestamp + request.method + path + request.data
    else:
        msg: str = timestamp + request.method + path

    signature: bytes = generate_signature(msg, self.secret)

问题依然没有解决，怀疑取到timestamp之后过了很久才向服务器发送请求