"Nginx 启用 HTTP/3(QUIC) 与回退策略实战"

Nginx 启用 HTTP/3(QUIC) 与回退策略实战基本配置server { listen 443 ssl http2; listen 443 quic reuseport; server_name example.com; ssl_certificate /etc/nginx/certs/server.crt; ssl_certificate_key /etc/nginx/certs/server.key; ssl_protocols TLSv1.3; add_header Alt-Svc 'h3=":443"; ma=86400'; location / { root /var/www/html; index index.html; } } 验证与回退浏览器开发者工具确认 `Alt-Svc: h3` 与协议为 `h3`无法使用 h3 时自动回退到 HTTP/2/1.1总结通过 `listen quic` 与 `Alt-Svc` 宣告，结合 TLS1.3，可平滑启用 HTTP/3 并兼容旧协议。