This is a beta release of the 2.0 series, with following changes including feature additions and bug fixes. The release also updates the bundled LibreSSL to 2.2.7 that includes a fix for CVE-2016-2107.

• [core] configurable server: header #877 (Frederik Deweerdt)
• [core] fix crash when receiving SIGTERM during start-up #878 (Frederik Deweerdt)
• [core] spawn the configured number of DNS client threads #880 (Sean McArthur)
• [access-log][fastcgi][mruby] per-request environment variables #868 (Kazuho Oku)
• [access-log] fix memory leak during start-up #864 (Frederik Deweerdt)
• [http2] support for nopush attribute in the link rel=preload header #863 (Satoh Hiroh)
• [http2] support for push after delegation #866 (Kazuho Oku)
• [http2] accept capacity-bits attribute of the http2-casper configuration directive #882 (Satoh Hiroh)
• [http2] ignore push indications made by a pushed response #897 (Kazuho Oku)
• [proxy] add support for HTTPS #875 (Kazuho Oku)
• [proxy] add an configuration option to pass through x-forwarded-proto request header #883 (Kazuho Oku)
• [proxy] log error when upstream connection is unexpectedly closed #895 (Frederik Deweerdt)
• [ssl] update libressl to 2.2.7 #898 (Kazuho Oku)
• [ssl] add support for text-based memcache protocol #854 (Kazuho Oku)
• [ssl] fix memory leak when using TLS resumption with the memcached backend #856 (Kazuho Oku)
• [ssl] fix "undefined subroutine" error in the OCSP updater #872 (Masayuki Matsuki)
• [ssl] cap the number of OCSP updaters running concurrently #891 (Kazuho Oku)
• [libh2o] add API for obtaining the socket descriptor #886 (Frederik Deweerdt)
• [libh2o] add API to selectively disable automated I/O on reads and writes #890 (Frederik Deweerdt)