curl
curl 是命令行下最通用的数据传输工具，支持 20+ 协议，从 HTTP 到 FTP 再到 MQTT。它既是日常调试的瑞士军刀，也是无数应用底层依赖的 libcurl 库。本文从实际使用场景出发，拆解 curl 的核心能力与真实边界。
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