面试官问你怎么防短信被刷，别开口就是"前端倒计时"——一开口就暴露了段位。先把这六道防线按从外到内的顺序捋出来。 美团二面，面试官把咖啡杯一放："你们线上短信接口被薅羊毛，一夜刷掉 5 万，你准备从哪几个层面防？" 我心里一稳——上家真吃过这亏，差点被 HR 约谈。这题不是考你会不会写 @RateLimiter，是考你从验证码到签名到蜜罐到网关兜底的全链路肌肉。 第1层｜滑块验证的后端二次校验：前 ...

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Fix the “Login Pool Is Empty and Connection Creation Failed” error with 5 proven solutions for HikariCP, Spring Boot, MySQL, PostgreSQL, JDBC, and database connection pools.

Will Kenton is an expert on the economy and investing laws and regulations. He previously held senior editorial roles at Investopedia and Kapitall Wire and holds a MA in Economics from The New School ...