*) Change: non-idempotent requests (POST, LOCK, PATCH) are no longer
passed to the next server by default if a request has been sent to a
backend; the "non_idempotent" parameter of the "proxy_next_upstream"
directive explicitly allows retrying such requests.
*) Feature: the ngx_http_perl_module can be built dynamically.
*) Feature: UDP support in the stream module.
*) Feature: the "aio_write" directive.
*) Feature: now cache manager monitors number of elements in caches and
tries to avoid cache keys zone overflows.
*) Bugfix: "task already active" and "second aio post" alerts might
appear in logs when using the "sendfile" and "aio" directives with
subrequests.
*) Bugfix: "zero size buf in output" alerts might appear in logs if
caching was used and a client closed a connection prematurely.
*) Bugfix: connections with clients might be closed needlessly if
caching was used.
Thanks to Justin Li.
*) Bugfix: nginx might hog CPU if the "sendfile" directive was used on
Linux or Solaris and a file being sent was changed during sending.
*) Bugfix: connections might hang when using the "sendfile" and "aio
threads" directives.
*) Bugfix: in the "proxy_pass", "fastcgi_pass", "scgi_pass", and
"uwsgi_pass" directives when using variables.
Thanks to Piotr Sikora.
*) Bugfix: in the ngx_http_sub_filter_module.
*) Bugfix: if an error occurred in a cached backend connection, the
request was passed to the next server regardless of the
proxy_next_upstream directive.
*) Bugfix: "CreateFile() failed" errors when creating temporary files on
Windows.
