SPDY 的說明文件如下述:
- SPDY - The Chromium Projects
- SPDY: An experimental protocol for a faster web
- draft-ietf-httpbis-http2-00 - SPDY Protocol
什麼是 SPDY? SPDY 作什麼事情?
SPDY 主要是希望可以讓現在 HTTP 加速, 加強 HTTP 的部份摘錄如下述: (取自上述官方文件)
SPDY is not the only research to make HTTP faster. There have been other proposed solutions to web latency, mostly at the level of the transport or session layer:
- Stream Control Transmission Protocol (SCTP) -- a transport-layer protocol to replace TCP, which provides multiplexed streams and stream-aware congestion control.
- HTTP over SCTP -- a proposal for running HTTP over SCTP. Comparison of HTTP Over SCTP and TCP in High Delay Networks describes a research study comparing the performance over both transport protocols.
- Structured Stream Transport (SST) -- a protocol which invents "structured streams": lightweight, independent streams to be carried over a common transport. It replaces TCP or runs on top of UDP.
- MUX and SMUX -- intermediate-layer protocols (in between the transport and application layers) that provide multiplexing of streams. They were proposed years ago at the same time as HTTP/1.1.
SPDY 可以幫 HTTP/HTTPS 速度提昇的數據 (摘錄自上述官方文件)
- The results show a speedup over HTTP of 27% - 60% in page load time over plain TCP (without SSL), and 39% - 55% over SSL.
關於 SPDY 的相關套件與模組
關於 SPDY 的相關文章、投影片介紹
- SPDY -WikiPedia
- Making the Web Faster with HTTP 2 Protocol
- Making the web speedier and safer with SPDY
- SPDY of the Future Might Blow Your Mind Today « Mike's Lookout, 下述摘錄自此文
What is SPDY?
SPDY is a protocol created by Google researchers. Announced first in 2009, it brings some of the original goals proposed by the HTTP-NG group in 1998. - Google 的 SPDY 將可能包含在下一代 HTTP 標準中, 下述摘錄自此文:
SPDY設計目標在減少 Client 和 Server 之間的延遲。
當資料經過 TCP 連接傳輸，發送端必須先等待接收方確認之後才能發送資料。
接受和確認所需的時間是由往返時間(Round-Trip Time)控制。
Client 和 Server 可能要將大部分時間花在確認上，而不是資料傳輸上。
通過 HTTP Header 壓縮、包優先權 和 reuse 等，SPDY能減少網頁載入時間。
HTTP 工作組 的 主席Mark Nottingham呼籲應該將SPDY包含在下一代HTTP/2.0標準中。 - Firefox 將支持 SPDY 協議, 下述摘錄自此文:
舊的 HTTP 和 TCP Protocol 不能充分利用頻寬，Google 的 SPDY Protocol 是基於TCP的應用層協議，一次會話能復用傳輸多個文件，降低頁面載入時間。
投影片: You Ain't SPDY (Ruby Nation), 下述為此投影片的一些重點摘錄:
- SPDY is a replacement for HTTP
- SPDY is backwards compatible with HTTP
- SPDY still does HTTP-like things
- SPDY is optimized for page load times
- SPDY
Built on SSL
Binary
Don't send redundant header information
Aggressively compress stuff
Use a single(!) tube
Only pay the warm-up penalty once
Just like downloading an Ubuntu ISO! - SPDY
SYN_STREAM
SYN_REPLY
RST_STREAM
SETTINGS
HEADERS
PING
GOAWAY
WINDOW_UPDATE
DATA