*) Change: now nginx is built with the PCRE2 library by default.

*) Change: now nginx always uses sendfile(SF_NODISKIO) on FreeBSD.

*) Feature: support for sendfile(SF_NOCACHE) on FreeBSD.

*) Feature: the $ssl_curve variable.

*) Bugfix: connections might hang when using HTTP/2 without SSL with the
   "sendfile" and "aio" directives.

Changes with nginx 1.21.1                                        06 Jul 2021

    *) Change: now nginx always returns an error for the CONNECT method.

    *) Change: now nginx always returns an error if both "Content-Length"
       and "Transfer-Encoding" header lines are present in the request.

    *) Change: now nginx always returns an error if spaces or control
       characters are used in the request line.

    *) Change: now nginx always returns an error if spaces or control
       characters are used in a header name.

    *) Change: now nginx always returns an error if spaces or control
       characters are used in the "Host" request header line.

    *) Change: optimization of configuration testing when using many
       listening sockets.

    *) Bugfix: nginx did not escape """, "<", ">", "\", "^", "`", "{", "|",
       and "}" characters when proxying with changed URI.

    *) Bugfix: SSL variables might be empty when used in logs; the bug had
       appeared in 1.19.5.

    *) Bugfix: keepalive connections with gRPC backends might not be closed
       after receiving a GOAWAY frame.

    *) Bugfix: reduced memory consumption for long-lived requests when
       proxying with more than 64 buffers.

cc -c -pipe  -O -W -Wall -Wpointer-arith -Wno-unused-parameter -Werror -g -DFD_SETSIZE=1024 -s -O2 -fno-strict-aliasing -pipe  -I src/core -I src/event -I src/event/modules -I src/os/win32 -I ../deps/pcre-8.45 -I ../deps/gd/include -I objs -I src/http -I src/http/modules \
        -o objs/addon/src/ngx_http_echo_foreach.o \
        ../deps/echo-nginx-module-0.62/src/ngx_http_echo_foreach.c
../deps/echo-nginx-module-0.62/src/ngx_http_echo_filter.c: In function 'ngx_http_echo_filter_init':
../deps/echo-nginx-module-0.62/src/ngx_http_echo_filter.c:49:12: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
   49 |            (unsigned long) ngx_http_top_header_filter);
      |            ^
../deps/echo-nginx-module-0.62/src/ngx_http_echo_filter.c:54:36: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
   54 |         dd("top body filter: %ld", (unsigned long) ngx_http_top_body_filter);
      |                                    ^
cc -c -pipe  -O -W -Wall -Wpointer-arith -Wno-unused-parameter -Werror -g -DFD_SETSIZE=1024 -s -O2 -fno-strict-aliasing -pipe -I src/core -I src/event -I src/event/modules -I src/os/win32 -I ../deps/pcre-8.45 -I ../deps/gd/include -I objs \
        -o objs/ngx_modules.o \
        objs/ngx_modules.c
cc1.exe: all warnings being treated as errors
make[1]: *** [objs/Makefile:1081: objs/addon/src/ngx_http_echo_filter.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make[1]: Leaving directory '/home/xinxilas/nginx'
make: *** [Makefile:10: build] Error 2

cl -c -O2  -W4 -WX -nologo -MT -Zi -Fdobjs/nginx.pdb -DFD_SETSIZE=1024 -Yungx_config.h -Fpobjs/ngx_config.pch -I src/core  -I src/event  -I src/event/modules  -I src/os/win32  -I ../deps/pcre-8.45  -I ../deps/gd/include  -I objs  -I src/http  -I src/http/modules  -Foobjs/addon/src/ngx_http_echo_module.obj  ../deps/echo-nginx-module-0.62/src/ngx_http_echo_module.c
ngx_http_echo_module.c
../deps/echo-nginx-module-0.62/src/ngx_http_echo_module.c(8): error C2220: the following warning is treated as an error
../deps/echo-nginx-module-0.62/src/ngx_http_echo_module.c(8): warning C4603: 'DDEBUG': macro is not defined or definition is different after precompiled header use
../deps/echo-nginx-module-0.62/src/ngx_http_echo_module.c(8): note: Add macro to precompiled header instead of defining here
../deps/echo-nginx-module-0.62/src/ngx_http_echo_module.c(22): note: use of precompiled header
E:\MinGW\msys\1.0\home\xinxilas\nginx\src\core\ngx_cycle.h(44): error C2079: 'new_log' uses undefined struct 'ngx_log_s'
E:\MinGW\msys\1.0\home\xinxilas\nginx\src\core\ngx_resolver.h(49): error C2079: 'log' uses undefined struct 'ngx_log_s'
E:\MinGW\msys\1.0\home\xinxilas\nginx\src\core\ngx_connection.h(42): error C2079: 'log' uses undefined struct 'ngx_log_s'
../deps/echo-nginx-module-0.62/src/ngx_http_echo_module.c(70): error C2146: syntax error: missing ')' before identifier 'opcode'

*) Change: support for NPN instead of ALPN to establish HTTP/2
   connections has been removed.

*) Change: now nginx rejects SSL connections if ALPN is used by the
   client, but no supported protocols can be negotiated.

*) Change: the default value of the "sendfile_max_chunk" directive was
   changed to 2 megabytes.

*) Feature: the "proxy_half_close" directive in the stream module.

*) Feature: the "ssl_alpn" directive in the stream module.

*) Feature: the $ssl_alpn_protocol variable.

*) Feature: support for SSL_sendfile() when using OpenSSL 3.0.

*) Feature: the "mp4_start_key_frame" directive in the
   ngx_http_mp4_module.
   Thanks to Tracey Jaquith.

*) Bugfix: in the $content_length variable when using chunked transfer
   encoding.

*) Bugfix: after receiving a response with incorrect length from a
   proxied backend nginx might nevertheless cache the connection.
   Thanks to Awdhesh Mathpal.

*) Bugfix: invalid headers from backends were logged at the "info" level
   instead of "error"; the bug had appeared in 1.21.1.

*) Bugfix: requests might hang when using HTTP/2 and the "aio_write"
   directive.

Changes with nginx 1.25.3                                        24 Oct 2023

    *) Change: improved detection of misbehaving clients when using HTTP/2.

    *) Feature: startup speedup when using a large number of locations.
       Thanks to Yusuke Nojima.

    *) Bugfix: a segmentation fault might occur in a worker process when
       using HTTP/2 without SSL; the bug had appeared in 1.25.1.

    *) Bugfix: the "Status" backend response header line with an empty
       reason phrase was handled incorrectly.

    *) Bugfix: memory leak during reconfiguration when using the PCRE2
       library.
       Thanks to ZhenZhong Wu.

    *) Bugfixes and improvements in HTTP/3.

*) Change: now nginx rejects HTTP/1.0 requests with the
   "Transfer-Encoding" header line.

*) Change: export ciphers are no longer supported.

*) Feature: OpenSSL 3.0 compatibility.

*) Feature: the "Auth-SSL-Protocol" and "Auth-SSL-Cipher" header lines
   are now passed to the mail proxy authentication server.
   Thanks to Rob Mueller.

*) Feature: request body filters API now permits buffering of the data
   being processed.

*) Bugfix: backend SSL connections in the stream module might hang after
   an SSL handshake.

*) Bugfix: the security level, which is available in OpenSSL 1.1.0 or
   newer, did not affect loading of the server certificates when set
   with "@SECLEVEL=N" in the "ssl_ciphers" directive.

*) Bugfix: SSL connections with gRPC backends might hang if select,
   poll, or /dev/poll methods were used.

*) Bugfix: when using HTTP/2 client request body was always written to
   disk if the "Content-Length" header line was not present in the
   request.