Quick primer on http2 Cyrus Dasadia @ExtremeUnix
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Quick primer on http2
Cyrus Dasadia @ExtremeUnix
HTTP 1.1 est. 1999
- Piggybacks on TCP
- No efficient reusability
- Head-of-line blocking Problem
Enter HTTP/2 (httpbis)- Started off from SPDY/3 draft
- HTTPbis working on draft-17
- Will not have any minor versions
- No change in http(s) URI pattern
How does it look?
Handshake
How does it look?
It’s all binary, love.
Seriously, how does it look?
Frames:
image: tools.ietf.org/html/draft-ietf-httpbis-http2-17
FramesBasic protocol unit of HTTP/2 is Frame● HEADERS● DATA● SETTINGS● PUSH_PROMISE● GOAWAY● ...few more
Header Frames- Request Pseudo-headers :method, :scheme, :
authority, :path
- Response Pseudo-headers :status
- Cookie header field uses semicolon “;”
- Header compression (HPACK)
Header FramesComparing HTTP/1.1 response with HTTP/2:
image: tools.ietf.org/html/draft-ietf-httpbis-http2-17
Streams- One TCP connection to rule them all!
- Concurrent, bi-directional and unilateral
- Streams can be prioritized and re-prioritized
- Stream can have dependency hierarchy
- Flow control avoids interference
Streams
Streams
Simple Prioritization Stream Hierarchy
image: tools.ietf.org/html/draft-ietf-httpbis-http2-17
PUSH_PROMISE
Current state:
- Google, Twitter, are on http2
- Facebook, HN are on SPDY
- cURL, ATS, Nghttp2
- Firefox, Chrome
Will it help me?
- No more than one connection per client
- Connection reusability by multiplexing
- TLS with a reduced hop
Will it help me?DIY http2 CDN?
P.S. Keep an eye out for RFC-7540
Thank you!
References:
http://tools.ietf.org/html/draft-ietf-httpbis-http2-17http://tools.ietf.org/html/draft-ietf-httpbis-header-compression-12http://chimera.labs.oreilly.com/books/1230000000545/ch12.htmlhttp://daniel.haxx.se/http2/https://github.com/http2/http2-spec/wiki/Implementationshttp://tools.ietf.org/rfc/rfc7540http://tools.ietf.org/rfc/rfc7541https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=51810161http://wiki.squid-cache.org/Features/HTTP2http://nginx.com/blog/how-nginx-plans-to-support-http2/https://github.com/tatsuhiro-t/nghttp2
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