HTTP 客户端 API 无法确切知道目标服务器是否支持 HTTP/3。此外，现有的 HTTP/1.1 和 HTTP/2 连接无法升级到 HTTP/3，因为 HTTP/1.1 和 HTTP/2 建立在 TCP 之上，而 HTTP/3 的 QUIC 基于 UDP 数据报。因此，API 需要一种协商协议版本的方式——为了实现这一点，它配备了四种不同的方法：
Новый лидер Ирана был ранен в первый день ударов по Тегерану. С тех пор он не появлялся на публике. Что известно о его состоянии?20:42
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Strong continues to rake in the national player of the year awards, and though she hasn't been otherworldly so far in the NCAA tournament, she has done what the Huskies have needed her to do to: lead them in scoring in their first-round win and be the rebounding and two-way force that makes her one of the most exciting prospects we've seen in some time. She has a knack for playing her best basketball when it counts -- she was arguably their best player in the Final Four last year when UConn won its first title since 2016 -- which should serve the Huskies well as the road gets tougher in Fort Worth, Texas, and ultimately Phoenix. -- Alexa Philippou