Nginx 1.13.9 发布了。主要对 Bug 进行了修复，并增加部分新特性。主要更新内容如下：
Feature: HTTP/2 server push support; the "http2_push" and "http2_push_preload" directives.
Bugfix: "header already sent" alerts might appear in logs when using cache; the bug had appeared in 1.9.13.
Bugfix: a segmentation fault might occur in a worker process if the "ssl_verify_client" directive was used and no SSL certificate was specified in a virtual server.
Bugfix: in the ngx_http_v2_module.