nginx不但可以作为http代理，还可以作为tcp反向代理
安装
openresty/1.9.15.1
config时候增加选项 --with-stream --with-stream_ssl_module
<pre>
events {
worker_connections 1024;
}
stream {
upstream backend {
server 127.0.0.1:7773;
}
server {
listen 30000;
proxy_timeout 20s;
proxy_pass backend;
}
}
</pre>
