nginx 1.19.2 主线版发布，修复了bug及改进功能

更新内容

nginx 1.19.2 更新日志                                       2020/08/11

*) Change:现在，nginx开始在所有可用的辅助连接用尽之前关闭Keepalive连接，并将关于此的警告记录到错误日志中。

*) Change:使用分块传输编码时，优化了客户请求正文的读取。

*) Bugfix:如果使用了“ ssl_ocsp”指令，则会发生内存泄漏。

*) Bugfix:如果FastCGI服务器返回错误响应，则日志中可能会出现“输出中的大小为零的buf”警报；该错误已在1.19.1中出现。

*) Bugfix:如果执行以下操作，则可能在工作进程中发生分段错误在不同的虚拟服务器中使用了不同的large_client_header_buffers大小。

*) Bugfix:SSL关闭可能不起作用。

*) Bugfix:“ SSL_shutdown（）失败（SSL：...错误的写入重试）”消息可能会出现在日志中。

*) Bugfix:位于ngx_http_slice_module中。

*) Bugfix:位于ngx_http_xslt_filter_module中。
(以上为谷歌机翻，待翻译）

原文

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.

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