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首先介绍了截获器的基本概念和要解决的具体问题，说明其设计原则，然后围绕截获点介绍了请求级截获器的具体实现方案。
First of all, the basic concepts of intercepter and the specific problems to be solved are introduced, the design principles are described, and then the implementation scheme of request-level intercepter is introduced around the interception point.