Learning HTTP/2

Table of Contents
1. Evolution of HTTP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
HTTP/0.9 and 1.0 8
HTTP/1.1 9
Beyond 1.1 10
SPDY 10
HTTP/2 11
2. Existing workarounds to improve Web Performance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Introduction 13
Best Practices for Web Performance 14
Optimize DNS lookups 14
Optimize TCP connections 15
Avoid redirects 16
Cache on the Client 16
Cache at the Edge (= on a CDN) 17
Check if content has changed before downloading it 17
Compress and minify text-like content 18
Avoid blocking CSS/JS 18
Optimize images 19
Anti-Patterns 21
Spriting and resource consolidation/inlining 21
Sharding 22
Cookie-less domains 22
Chapter summary 22
3. The Protocol. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
The Connection 26
Frames 28
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