• Implements h2-12 protocol (http://tools.ietf.org/html/draft-ietf-httpbis-http2-12)
• Implements HPACK 07 (http://tools.ietf.org/html/draft-ietf-httpbis-header-compression-07)
• HPACK APIs were added.
• APIs are not compatible to the previous version.
• New callback function nghttp2_select_padding_callback was added.
• nghttp2_submit_request() and nghttp2_submit_headers() now return new stream ID if they create new stream.
• nghttp2_submit_push_promise() now returns promised stream ID.
• h2load, benchmarking tool for HTTP/2 and SPDY, was added.