nginx-1.7.11 开发版发布

nginx-1.7.11 开发版发布了，增加了线程池，代理请求缓存等功能。详情如下：


*) Change: the "sendfile" parameter of the "aio" directive is
deprecated; now nginx automatically uses AIO to pre-load data for
sendfile if both "aio" and "sendfile" directives are used.

*) Feature: experimental thread pools support.

*) Feature: the "proxy_request_buffering", "fastcgi_request_buffering",
"scgi_request_buffering", and "uwsgi_request_buffering" directives.

*) Feature: request body filters experimental API.

*) Feature: client SSL certificates support in mail proxy.
Thanks to Sven Peter, Franck Levionnois, and Filipe Da Silva.

*) Feature: startup speedup when using the "hash ... consistent"
directive in the upstream block.
Thanks to Wai Keen Woon.

*) Feature: debug logging into a cyclic memory buffer.

*) Bugfix: in hash table handling.
Thanks to Chris West.

*) Bugfix: in the "proxy_cache_revalidate" directive.

*) Bugfix: SSL connections might hang if deferred accept or the
"proxy_protocol" parameter of the "listen" directive were used.
Thanks to James Hamlin.

*) Bugfix: the $upstream_response_time variable might contain a wrong
value if the "image_filter" directive was used.

*) Bugfix: in integer overflow handling.
Thanks to Régis Leroy.

*) Bugfix: it was not possible to enable SSLv3 with LibreSSL.

*) Bugfix: the "ignoring stale global SSL error ... called a function
you should not call" alerts appeared in logs when using LibreSSL.

*) Bugfix: certificates specified by the "ssl_client_certificate" and
"ssl_trusted_certificate" directives were inadvertently used to
automatically construct certificate chains.