Nginx 主线版 1.15.1 已发布，该版本新增了一个随机负载均衡的方法(random load balancing method)，还包括一些其他的新增功能和 bug 修复。
Feature: the "random" directive inside the "upstream" block.
Feature: improved performance when using the "hash" and "ip_hash" directives with the "zone" directive.
Feature: the "reuseport" parameter of the "listen" directive now uses SO_REUSEPORT_LB on FreeBSD 12.
Bugfix: HTTP/2 server push did not work if SSL was terminated by a proxy server in front of nginx.
Bugfix: the "tcp_nopush" directive was always used on backend connections.
Bugfix: sending a disk-buffered request body to a gRPC backend might fail.