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Http2 on go1.6rc2

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Jxck Jxck
Jxck Jxck

This document discusses HTTP/2 support in Go 1.6. It notes that the net/http package now supports HTTP/2 out of the box. It provides code samples showing how a server can be configured with and without HTTP/2 support. It also describes how HTTP/2 functionality like HPACK header compression, server push, flow control, and priority are implemented in Go net/http. Finally, it summarizes the current level of HTTP/2 specification compliance and areas still in development.

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HTTP2 on Go1.6 Go1.6 Release Party 2016 Jxck
● id: Jxck ● github: Jxck ● twitter: @jxck_ ● blog: https://blog.jxck.io ● podcast: http://mozaic.fm ● Love: music Jack
3 #http2study #wdpress vol.75#http2go (deprecated) and more... #mozaicfm ep2 http2 activity
RFC7540 4
5 HTTP2 in Go1.6
net/http supports http2 6
7 before import ( fmt log net/http ) func main() { var s http.Server s.Addr = ":8080" http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { w.Header().Set("Content-Type", "text/plain") fmt.Fprintf(w, "Hello World") }) log.Fatal(s.ListenAndServeTLS(cert, key)) }
8 after import ( fmt log net/http ) func main() { var s http.Server s.Addr = ":8080" http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { w.Header().Set("Content-Type", "text/plain") fmt.Fprintf(w, "Hello World") }) log.Fatal(s.ListenAndServeTLS(cert, key)) }
9 you don’t need this after 1.6 $ git clone --depth=1 https://go.googlesource.com/go $HOME/gotip $ cd $HOME/gotip/src $ ./make.bash $ cd $YOUR_PROJ $ $HOME/gotip/bin/go {install,build,test}.
10 how http2 bundled ? $ tree $GOROOT/src/net/http |-- fs.go |-- fs_test.go |-- h2_bundle.go |-- header.go |-- header_test.go |-- http_test.go $ bundle golang.org/x/net/http2 net/http http2 bundle golang.org/x/net/http2 into net/http package prefixed with `http2`
prefixed source 11 bundled original
inject h2 to net/http2 12 App App ALPN http/2 client http/1.1 client http/1.1 server http/2 server TCP req/res | frame req/res | frameframe req/res req/resreq/res
inside (current status rc2) 13
hpack 14 ● compress http header ○ with static/dynamic table ○ with huffman encoding ○ with binary frame ● Encode Strategy ○ depends on implement ● Benchmark ○ using hpack-test-case ○ https://gist.github.com/Jxck/a2125cfc162229e4f54f implementation go-hpack haskell nghttp2 node-http2 ration(small is better) 31% 31% 31% 31% 2016/2/18 benchmark script has a bug, results are updated.
Server Push 15 ● Push data from server ○ sending PUSH_PROMISE frame ● Low Level API ○ WritePushPromise() ● High Level API ○ not yet ○ wip ? https://goo.gl/IV0fyI // CAUTION: wip code if p, ok := w.(http2.Pusher); push && ok { p.Push("GET", “/path/to/push”, nil) }
Flow Control 16 ● 2 Level Flow Control ○ Stream level ○ Connection level ○ with WindowUpdate Frame ● Current Implement ○ supported ○ default sends big window update for connection ○ stream window update each 4M transfer
Priority 17 ● Priorities Contents ○ with weight of Stream ○ make dependency tree ○ ignorable ○ ex) high for html, low for image.. ● Low Level ○ WritePriority() ● High Level ○ no high level api ○ no auto priorities content like html, css, img etc ○ priority respected ?? I can’t find.
Spec Coverage 18 ● testing with h2spec ○ https://github.com/summerwind/h2spec ● toward http2.golang.org $ h2spec -t http2.golang.org 3.5. HTTP/2 Connection Preface ✓ Sends invalid connection preface ….. 8.2. Server Push ✓ Sends a PUSH_PROMISE frame 71 tests, 58 passed, 0 skipped, 13 failed
more 19 ● DEBUG ● h2i $ GODEBUG="http2debug=1" go run main.go $ GODEBUG="http2debug=2" go run main.go $ h2i jxck.io Connected to 160.16.234.102:443 ... h2i> headers (as HTTP/1.1)> GET / HTTP/1.1 (as HTTP/1.1)> Opening Stream-ID 1: ...
Go to the HTTP2!! 20
Jack

More Related Content

Http2 on go1.6rc2

  • 1. HTTP2 on Go1.6 Go1.6 Release Party 2016 Jxck
  • 2. ● id: Jxck ● github: Jxck ● twitter: @jxck_ ● blog: https://blog.jxck.io ● podcast: http://mozaic.fm ● Love: music Jack
  • 3. 3 #http2study #wdpress vol.75#http2go (deprecated) and more... #mozaicfm ep2 http2 activity
  • 7. 7 before import ( fmt log net/http ) func main() { var s http.Server s.Addr = ":8080" http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { w.Header().Set("Content-Type", "text/plain") fmt.Fprintf(w, "Hello World") }) log.Fatal(s.ListenAndServeTLS(cert, key)) }
  • 8. 8 after import ( fmt log net/http ) func main() { var s http.Server s.Addr = ":8080" http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { w.Header().Set("Content-Type", "text/plain") fmt.Fprintf(w, "Hello World") }) log.Fatal(s.ListenAndServeTLS(cert, key)) }
  • 9. 9 you don’t need this after 1.6 $ git clone --depth=1 https://go.googlesource.com/go $HOME/gotip $ cd $HOME/gotip/src $ ./make.bash $ cd $YOUR_PROJ $ $HOME/gotip/bin/go {install,build,test}.
  • 10. 10 how http2 bundled ? $ tree $GOROOT/src/net/http |-- fs.go |-- fs_test.go |-- h2_bundle.go |-- header.go |-- header_test.go |-- http_test.go $ bundle golang.org/x/net/http2 net/http http2 bundle golang.org/x/net/http2 into net/http package prefixed with `http2`
  • 12. inject h2 to net/http2 12 App App ALPN http/2 client http/1.1 client http/1.1 server http/2 server TCP req/res | frame req/res | frameframe req/res req/resreq/res
  • 14. hpack 14 ● compress http header ○ with static/dynamic table ○ with huffman encoding ○ with binary frame ● Encode Strategy ○ depends on implement ● Benchmark ○ using hpack-test-case ○ https://gist.github.com/Jxck/a2125cfc162229e4f54f implementation go-hpack haskell nghttp2 node-http2 ration(small is better) 31% 31% 31% 31% 2016/2/18 benchmark script has a bug, results are updated.
  • 15. Server Push 15 ● Push data from server ○ sending PUSH_PROMISE frame ● Low Level API ○ WritePushPromise() ● High Level API ○ not yet ○ wip ? https://goo.gl/IV0fyI // CAUTION: wip code if p, ok := w.(http2.Pusher); push && ok { p.Push("GET", “/path/to/push”, nil) }
  • 16. Flow Control 16 ● 2 Level Flow Control ○ Stream level ○ Connection level ○ with WindowUpdate Frame ● Current Implement ○ supported ○ default sends big window update for connection ○ stream window update each 4M transfer
  • 17. Priority 17 ● Priorities Contents ○ with weight of Stream ○ make dependency tree ○ ignorable ○ ex) high for html, low for image.. ● Low Level ○ WritePriority() ● High Level ○ no high level api ○ no auto priorities content like html, css, img etc ○ priority respected ?? I can’t find.
  • 18. Spec Coverage 18 ● testing with h2spec ○ https://github.com/summerwind/h2spec ● toward http2.golang.org $ h2spec -t http2.golang.org 3.5. HTTP/2 Connection Preface ✓ Sends invalid connection preface ….. 8.2. Server Push ✓ Sends a PUSH_PROMISE frame 71 tests, 58 passed, 0 skipped, 13 failed
  • 19. more 19 ● DEBUG ● h2i $ GODEBUG="http2debug=1" go run main.go $ GODEBUG="http2debug=2" go run main.go $ h2i jxck.io Connected to 160.16.234.102:443 ... h2i> headers (as HTTP/1.1)> GET / HTTP/1.1 (as HTTP/1.1)> Opening Stream-ID 1: ...
  • 20. Go to the HTTP2!! 20
  • 21. Jack