master
Events: fixed style and wrong error handling in the iocp module.
QUIC: zero out existing keying material only.
QUIC: automatically add and never delete stream events.
Merged with the default branch.
Events: fixed balancing between workers with EPOLLEXCLUSIVE.
Introduced the "keepalive_time" directive.
HTTP/2: made it possible to flush response headers (ticket #1743).
Modules compatibility: down flag in ngx_peer_connection_t.
Style.
SSL: fixed possible configuration overwrite loading "engine:" keys.
SSL: reasonable version for LibreSSL adjusted.
Upstream: fixed usage of closed sockets with filter finalization.
Modules compatibility: compatibility with NGX_THREADS.
SSL: reworked posted next events again.
Core: added the ngx_rbtree_data() macro.
Cancelable timers are now preserved if there are other timers.
Common tree insert function for QUIC and UDP connections.