Feature: the "proxy_protocol" directive in the stream and mail modules now supports the PROXY protocol version 2. Change: now HTTP/2 and gRPC requests to backends are always sent with the ":authority" pseudo-header, and HTTP/1.1 requests - with the "Host" header. Bugfix: a segmentation fault might occur in a worker process if the "select" method was used. Bugfix: incomplete gRPC responses with a non-zero "Content-Length" header line are now treated as malformed. Bugfix: in binary compatibility with third-party modules using script codes; the bug had appeared in 1.31.3. Bugfix: in the ngx_http_perl_module. Thanks to David Carlier. Bugfixes in HTTP/2, HTTP/3, ngx_http_image_filter_module, and ngx_http_grpc_module.