Recommended
More Related Content
What's hot
What's hot (20)
Similar to HTTP2：新的机遇与挑战
Similar to HTTP2：新的机遇与挑战 (20)
Recently uploaded
Recently uploaded (20)
HTTP2：新的机遇与挑战
- 2. 2008.4 ~ 2011.5 2011.8 ~ 360 360 https://imququ.com
- 3. Part I HTTP Hypertext Transfer Protocol
- 4. $> telnet igvita.com 80 Connected to 173.230.151.99 GET /archive Hypertext delivery with HTTP 0.9! - eom. (connection closed) HTTP 0.9 is the ultimate MVP - one line, plain-text “protocol” to test drive the “www idea”. HTTP 0.9 1991 / ASCII CRLF HTML
- 5. $> telnet ietf.org 80 Connected to 74.125.xxx.xxx GET /rfc/rfc1945.txt HTTP/1.0 User-Agent: CERN-LineMode/2.15 libwww/2.17b3 Accept: */* HTTP/1.0 200 OK Content-Type: text/plain Content-Length: 137582 Last-Modified: Wed, 1 May 1996 12:45:26 GMT Server: Apache 0.84 4 years of rapid iteration later… eom. (connection closed) HTTP 1.0 is an informational RFC - documents HTTP 1.0 1996
- 6. $> telnet google.com 80 Connected to 74.125.xxx.xxx GET /index.html HTTP/1.1 Host: website.org User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_4)... (snip) Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Encoding: gzip,deflate,sdch Accept-Language: en-US,en;q=0.8 Cookie: __qca=P0-800083390... (snip) HTTP/1.1 200 OK Connection: keep-alive Transfer-Encoding: chunked Server: nginx/1.0.11 Content-Type: text/html; charset=utf-8 Date: Wed, 25 Jul 2012 20:23:35 GMT Expires: Wed, 25 Jul 2012 20:23:35 GMT Cache-Control: max-age=0, no-cache 100 <!doctype html> (snip) HTTP 1.1 1999 Connection: keep-alive Transfer-Encoding: chunked Accept-Ranges
- 7. HTTP 1.1 2014 RFC2616 - Hypertext Transfer Protocol -- HTTP/1.1 RFC7230 - HTTP/1.1: Message Syntax and Routing - low-level message parsing and connection management RFC7231 - HTTP/1.1: Semantics and Content - methods, status codes and headers RFC7232 - HTTP/1.1: Conditional Requests - e.g., If-Modified-Since RFC7233 - HTTP/1.1: Range Requests - getting partial content RFC7234 - HTTP/1.1: Caching - browser and intermediary caches RFC7235 - HTTP/1.1: Authentication - a framework for HTTP authentication ✗ ✔
- 8. SPDY ? 2012 - 2015
- 12. ● Cable profile (5Mbps / 28 ms RTT) ● Main thread attributionin Blink o Measured via Telemetry ● 69.5% of time blocked on network ● 6.6% of time blocked JavaScript ● 5.1% blocked on Layout ● 4.5% blocked on Paint ● ... No surprises here... First page load is network (latency) bound! TOP 1M Alexa Sites
- 13. HTTP - TCP /
- 14. Keep-Alive TCP ✗
- 15. Pipelining
- 21. • Batch Ajax Request • CSS Sprite • CSS JS Concatenation • CSS JS Inline • Data URI • ... ...
- 26. TCP / - TCP 6 - DNS TCP TCP - - HTTP - - Cookie-Less - CSS JS -
- 28. Part III HTTP2
- 29. HTTP/2 RFC 7540 - Hypertext Transfer Protocol Version 2 (HTTP/2) RFC 7541 - HPACK: Header Compression for HTTP/2
- 30. HTTP/2 TCP => Stream - Multiplexed - Prioritized - Prioritization - Flow control - Server Push Header Compression HPACK
- 34. =>
- 35. =>
- 37. HPACK header compression ● Literal values are (optionally) encoded with a static Huffman code ● Previously sent values are (optionally) indexed ○ e.g. “2” in above example expands to “method: GET” HTTP/1
- 42. ↓~54%
- 43. ↓~90%
- 46. Part IV HTTP2
- 47. Web Server >>
- 49. HTTP/2 HTTP/2
- 50. H2C HTTP/2 Cleartext Firefox Chrome Safari IE Edge H2C
- 51. Chrome HTTPS 2015 8 Chrome HTTPS 63%
- 52. HTTPS
- 54. ALPN
- 55. HTTP/2 HTTP/2
- 56. Chrome FireFox
- 60. Wireshark
- 61. HTTP/1 HTTP/2
- 62. >>
- 63. >>
- 64. Part V HTTP2
- 65. Is TLS Fast Yet? https://istlsfastyet.com/
- 68. iana
- 69. RSA cloudflare
- 70. ECDHE cloudflare
- 71. TLS
- 72. TLS Caching
- 73. TLS Tickets
- 74. TLS Tickets
- 75. TLS
- 76. TLS False Start
- 77. TLS
- 79. ECC ECC Elliptic Curve Cryptography 256 ECC Key 3072 RSA Key
- 81. OCSP Online Certificate Status Protocol
- 82. HSTS HTTP Strict Transport Security strict-transport-security: max-age=16070400; includeSubDomains
- 83. SSL OpenSSL LibreSSL BoringSSL - PC AES-GCM AES-NI CPU - ChaCha20-Poly1305 ARM CPU
- 84. >> TLS
- 85. HTTP/2
- 86. DNS • • dns-prefetch • CDN • • JS CSS HTML • PngOut PngCrush JpegOptim GifSicle • GZip HTTP • Expires / Cache-Control Last-Modified / ETag
- 87. HTTP/2
- 88. - HTTP/2 TCP - TCP CPU - HTTP/2 - HTTP/2 TCP - - CPU - HTTP/2 Server Push - -
- 89. HTTP/2 - IP -
- 90. Server Push - Cookie - Cookie Push
- 91. Part VI HTTP2
- 93. Web Server Server Push HTTP/2 10 HTTP/1.1 HTTP/2 Web
- 94. TCP TCP Head of Line Blocking TCP HTTP/2 TCP Google QUIC Quick UDP Internet Connections
- 96. && Web - Ilya Grigorik - HTTP - David Gourley Brian Totty Marjorie Sayer Sailu Reddy Anshu Aggarwal - HTTP-2 is here, let's optimize! - Velocity SC 2015 - Ilya Grigorik
- 97. Nginx/H2O HTTP/2 Wireshark HTTP/2 HTTP/2 BoringSSL HTTPS H2O Cache-Aware Server Push TLS HTTP/2 ... ... https://imququ.com
- 98. Thank You! Q & A quguangyu@gmail.com