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map $http_upgrade $connection_upgrade {
    default upgrade;
    '' close;
}

upstream websocket {
    server localhost:9090;
    server localhost:9091;
    server localhost:9092;
}

server {
    listen 8080;
    location /ws {
        proxy_pass http://websocket;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;
        proxy_read_timeout 600s; 
    }

}

proxy_read_timeout默认是60s，如果60s内没有通信，长连接会断开。所以需要心跳机制，在这个时段内发送心跳。