nginx-1.20.0 stable version has been released, incorporating new features and bug fixes from the 1.19.x mainline branch — including OCSP validation of client SSL certificates, the ssl_reject_handshake and ssl_conf_command directives, simplified and improved handling of HTTP/2 connections with the lingering_close, keepalive_timeout, and keepalive_requests directives, the keepalive_time directive, stricter handling of upstream server responses, cookie flags handling, cache clearing based on the minimum amount of free space, PROXY protocol support from clients and to backend servers in the mail proxy, proxying SMTP authentication, the set directive in the stream module, and more.