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What is a token

Time:10-26

1. The introduction of the token: token is frequent in the client to the service request data, the server frequently to database query, comparing the user name and password to determine the user name and password is correct, and make corresponding hint, in this context token arises at the historic moment,
2. The definition of token: token is generated by the server of a string of a string, as the client requests a token, when a login server to generate a token will be the token returned to the client, the client only need to take before the request after the token request data,
3. Using a token purpose: to reduce the pressure of the server, reduce frequent query the database, server is more robust,

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