Clash 的 url-test 模式，通过测试连接给定 URL 的速度来决定使用哪个 proxy
Dreamacro/clashgithub.com/Dreamacro/clashProxy Group: # url-test select which proxy will be used by benchmarking speed to a URL. - { name: "auto", type: url-test, proxies: ["ss1", "ss2", "vmess1"], url: "", interval: 300 }