- http: fixed a crash upon receiving empty HTTP/2 metadata frames. Received empty metadata frames are now counted in the HTTP/2 codec stat :ref:`metadata_empty_frames <v1.15:config_http_conn_man_stats_per_codec>`.
- http: fixed a remotely exploitable integer overflow via a very large grpc-timeout value causes undefined behavior.
- http: fixed URL parsing for HTTP/1.1 fully qualified URLs and connect requests containing IPv6 addresses.
- http: fixed bugs in datadog and squash filter's handling of responses with no bodies.
- http: reverting a behavioral change where upstream connect timeouts were temporarily treated differently from other connection failures. The change back to the original behavior can be temporarily reverted by setting
envoy.reloadable_features.treat_upstream_connect_timeout_as_connect_failureto false. - tls: fix detection of the upstream connection close event.
Normally occurs at the end of the :ref:`deprecation period <v1.15:deprecated>`