• Implements RFC 7540 HTTP/2 (https://tools.ietf.org/html/rfc7540)
• implements RFC 7541 HPACK (https://tools.ietf.org/html/rfc7541)
• v1.0.0 introduced backward incompatible changes from 0.7 series. Read https://nghttp2.org/documentation/package_README.html#migration-from-v0-7-15-or-earlier to migrate from older version to this latest version.