If it is less than the maximum page request count, the new visit object is saved to the session.
如果小于最大页面请求计数，则新的visit对象被保存到会话中。
maxfc: This reports back the maximum fastpath request count since the last time this value was fetched.
maxfc：这个参数用于报告从上一次获取这个值以来快速路径请求计数的最大值。
maxfc: This reports back the maximum fastpath request count since the last time this value was fetched.
maxfc：这个参数用于报告从上一次获取这个值以来快速路径请求计数的最大值。
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