nginx之代理websocket

nginx代理websocket：
NGINX通过允许一个在客户端和后端服务器之间建立的隧道来支持WebSocket。
为了NGINX发送来至于客户端Upgrade请求到后端服务器，Upgrade和Connection头部必须被设置明确

map $http_upgrade $connection_upgrade {
    default Upgrade;
    ''      close;
}
server {
    server_name kubesphere.www.com;
    location ~ / {
        proxy_http_version 1.1;
        proxy_set_header HOST $host;
        proxy_set_header X-Forwarded-Port $server_port;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_pass http://10.1.1.12:30880;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;
        proxy_read_timeout 900s;
        proxy_buffering off;
    }

验证websocket服务：

curl --no-buffer -H 'Connection: keep-alive, Upgrade' -H 'Upgrade: websocket' -v -H 'Sec-WebSocket-Version: 13' -H 'Sec-WebSocket-Key: websocket' http://192.244.0.43:9103/alive