nginx keepalive
http://nginx.org/en/docs/http/ngx_http_upstream_module.html#keepalive
转载于:https://blog.51cto.com/tenderrain/2122172
http://nginx.org/en/docs/http/ngx_http_upstream_module.html#keepalive
转载于:https://blog.51cto.com/tenderrain/2122172