There is a general consensus that this change results in better
consistency between different operating systems and differently
tuned operating systems.
Note: this changes the width and meaning of the ipv6only field
of the ngx_listening_t structure. 3rd party modules that create
their own listening sockets might need fixing.
NetBSD 5.0+ has SO_ACCEPTFILTER support merged from FreeBSD, and having
accept filter check in FreeBSD-specific ngx_freebsd_config.h prevents it
from being used on NetBSD. Therefore move the check into configure (and
do the same for Linux-specific TCP_DEFER_ACCEPT, just to be in line).
to ngx_configure_listening_sockets(), otherwise listen socket logs have no file
after first reload and this caused segfault if debug_connection was used;
the bug has been introduced in r2786
*) Feature: the "uninitialized_variable_warn" directive; the logging
level of the "uninitialized variable" message was lowered from
"alert" to "warn".
*) Feature: the "override_charset" directive.
*) Change: now if the unknown variable is used in the "echo" and "if
expr='$name'" SSI-commands, then the "unknown variable" message is
not logged.
*) Bugfix: the active connection counter increased on the exceeding of
the connection limit specified by the "worker_connections"
directive; the bug had appeared in 0.2.0.
*) Bugfix: the limit rate might not work on some condition; the bug had
appeared in 0.3.38.
*) Bugfix: the accept-filter and the TCP_DEFER_ACCEPT option were set
for first "listen" directive only; the bug had appeared in 0.3.31.
*) Bugfix: in the "proxy_pass" directive without the URI part in a
subrequest.
*) Change: the "variables_hash_max_size" and
"variables_hash_bucket_size" directives.
*) Feature: the $body_bytes_sent variable can be used not only in the
"log_format" directive.
*) Feature: the $ssl_protocol and $ssl_cipher variables.
*) Feature: the cache line size detection for widespread CPUs at start
time.
*) Feature: now the "accept_mutex" directive is supported using
fcntl(2) on platforms different from i386, amd64, sparc64, and ppc.
*) Feature: the "lock_file" directive and the --with-lock-path=PATH
autoconfiguration directive.
*) Bugfix: if the HTTPS protocol was used in the "proxy_pass" directive
then the requests with the body was not transferred.
*) Workaround: for bug in FreeBSD kqueue.
*) Bugfix: now a response generated by the "post_action" directive is
not transferred to a client.
*) Bugfix: the memory leaks were occurring if many log files were used.
*) Bugfix: the first "proxy_redirect" directive was working inside one
location.
*) Bugfix: on 64-bit platforms segmentation fault may occurred on start
if the many names were used in the "server_name" directives; the bug
had appeared in 0.3.18.
