Bugfix: the proxy_next_upstream mechanism did not work correctly when using the resolve option of the server directive in the HTTP block if the number of resolved IP addresses differed from the number of specified servers.
Bugfix: while requesting a certificate via the ACME protocol, a segmentation fault could occur in a worker process.
Bugfix: the slow_start mechanism did not work when proxying TCP connections in the stream module.
Bugfix: HTTP/3 requests could result in an error if received as TLS 1.3 early data; the bug had appeared in 1.4.0.
Bugfix: HTTP/3 connection could be prematurely closed while using 0-RTT in QUIC.
Bugfix: when reading a request body from a fast connection, reading for a long time was possible. Thanks to Maxim Dounin (freenginx).
Change: now ACME clients do not discard previously stored certificates that were expired or issued for a different domain list, but use them while renewing.