Nginx 1.19.2 官方更新日志：
http://nginx.org/en/CHANGES

Changes with nginx 1.19.2                                        11 Aug 2020

    *) Change: now nginx starts closing keepalive connections before all
       free worker connections are exhausted, and logs a warning about this
       to the error log.

    *) Change: optimization of client request body reading when using
       chunked transfer encoding.

    *) Bugfix: memory leak if the "ssl_ocsp" directive was used.

    *) Bugfix: "zero size buf in output" alerts might appear in logs if a
       FastCGI server returned an incorrect response; the bug had appeared
       in 1.19.1.

    *) Bugfix: a segmentation fault might occur in a worker process if
       different large_client_header_buffers sizes were used in different
       virtual servers.

    *) Bugfix: SSL shutdown might not work.

    *) Bugfix: "SSL_shutdown() failed (SSL: ... bad write retry)" messages
       might appear in logs.

    *) Bugfix: in the ngx_http_slice_module.

    *) Bugfix: in the ngx_http_xslt_filter_module.