Nginx 配置 webSocket 支持

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

     # 负载均衡配置
     upstream websocket {
                    server 127.0.0.1:8090;
                    server 127.0.0.1:8091;
                    server 127.0.0.1:8092;
            }

server {
            listen       80;
            location / {
                client_max_body_size 100m;
                root   html;
                index  index.html index.htm;
                proxy_pass http://tomcat_server;
                proxy_set_header Host $http_host;
                proxy_connect_timeout 18000;
                proxy_send_timeout 18000;
                proxy_read_timeout 18000;
                proxy_ignore_client_abort on;
                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_set_header X-Forwarded-Host $server_name;
                # websocket 支持
                proxy_http_version 1.1;
                proxy_set_header Upgrade $http_upgrade;
                proxy_set_header Connection $connection_upgrade;
            }
}

 客户端建立连接数量配置

events {
    worker_connections 40960;
    multi_accept on;
    use epoll;
}

    sendfile            on;
    tcp_nopush          on;
    tcp_nodelay         on;
    keepalive_timeout   65;
    types_hash_max_size 2048;

    client_header_timeout 120s;        #调大点
    client_body_timeout 120s;          #调大点
    client_max_body_size 100m;         #主要是这个参数，限制了上传文件大大小
    client_body_buffer_size 256k;