Changes with nginx 1.20.2 16 Nov 2021
*) Feature: OpenSSL 3.0 compatibility.
*) 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: backend SSL connections in the stream module might hang after an SSL handshake.
*) Bugfix: SSL connections with gRPC backends might hang if select, poll, or /dev/poll methods were used.
*) Bugfix: in the $content_length variable when using chunked transfer encoding.
*) Bugfix: requests might hang when using HTTP/2 and the "aio_write" directive.