[nginx-announce] nginx-1.21.4

[Maxim Dounin]

Changes with nginx 1.21.4                                        02 Nov 2021

    *) 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.


-- 
Maxim Dounin
http://nginx.org/