配置 “$connection_upgrade” 变量
连接升级通常与 WebSockets 结合使用。 在 nginx 中，我们可以根据 $http_upgrade 变量将 HTTP 连接升级为 WebSocket 连接。
我们可以使用 map 块在 nginx 中定义连接和 http 升级之间的依赖关系：
vim nginx.conf文章来源：https://www.toymoban.com/news/detail-635824.html
map $http_upgrade $connection_upgrade {
default upgrade;
'' close;
}
如果 Upgrade 标头设置为 ‘’，此 map 块告诉 nginx 正确设置相关的 Connection 标头来关闭连接。
将 map 块放入 nginx 配置的 http 块中。 nginx 配置的默认文件路径是 /etc/nginx/nginx.conf 。文章来源地址https://www.toymoban.com/news/detail-635824.html
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