这篇要解决的就是这个场景：用 Node.js + Express.js + MongoDB + Mongoose + Express-Validator + Async Handler 搭一个能跑、能校验、能统一处理错误的 REST API 骨架。它不是一个玩具 demo，而是一个你可以直接往里加业务代码的结构。适合谁？刚学完 JavaScript、想动手写第一个后端接口的人；或者写过一点 ...

本文基于 Undici v8 官方迁移文档（migrating-from-v7-to-v8.md），完整覆盖从 Undici v7 升级到 v8 时最可能遇到的破坏性变更：自定义 dispatcher handler 回调全面切换到 v2 API、onBodySent() 签名变化、HTTP/2 默认启用、真实 Blob/File 校验，以及内部全局 dispatcher symbol 的迁移。

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