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Landing the second time can be logged in, the first session is empty

Source: Internet
Author: User
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Login for the second time to log in, the first time the session is empty
My background site landing place, the first time when the incoming session, to the homepage of the past is 0, and then landing again, the session will have value, do not know what the reason, ask you to help the great God
------Solution--------------------
Obviously the code is wrong.
------Solution--------------------
From the landing start step by step debugging which link is wrong
------Solution--------------------
The request was one step behind.

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