Explain what is a CDN, its advantages, and how to exploit caching on the internet. I cover Akamai in specific, along practices around Cache Headers, Cookie less domains, Fingerprinting, etc.
This talk was delivered at GIDS Bangalore (Apr 2015).
2. Agenda
• What is a CDN?
• Brief on Akamai
• Advantages of a CDN
• Exploiting Caching
• Statistics & Numbers
• Architectural Considerations
• Further References
3. About Me - Gurpreet Luthra
• 13+ years, Developer & Lead Consultant
• Working on Scala
• Spent last few months harnessing Akamai
• Twitter: _zenx_
4. What is a CDN?
http://my-retail-store.com (GET)
5. What is a CDN?
Hash
Table
Cache for all your HTTP Get Requests
http://my-retail-store.com (GET)
6. What is a CDN?
Ha
Spread them all over the World!
Ha
Ha
Ha
Ha
Ha
Ha
ORIGIN
7. CDN Distribution Scheme
"NCDN - CDN" by Kanoha - Own work. Licensed under CC BY-SA 3.0 via Wikimedia Commons
http://commons.wikimedia.org/wiki/File:NCDN_-_CDN.png#/media/File:NCDN_-_CDN.png
10. • 15-30% of all Web Traffic
• $1.96 Billion Annual Revenue
• 5000+ employees
• 170,000 Servers in 102 countries
• 2 trillion daily Internet interactions
http://www.akamai.com/html/about/facts_figures.html
21. Recap — Why CDN?
• Caching: Reduced Page Construction Time
• Closer: Reduced Latency
• Traffic Offloaded: Reduced Loads
• Backup: Served even if site is down
• Protection: Prevent DoS Attacks
• Others: Redirects/Auto-compression/Best-route
detection
23. Types of Caches on the Internet
• Web browser
• Proxy
• CDNs
• Reverse Proxies
• Web Server’s / Specialized Caches
24. What would we love?
• Cache Forever
• Deploy immediately
34. Cookie-less Domain
• Why submit cookies for every GET request
for assets?
http://my-assets-host.com/css/
global-908e25f4bf641868d8683022a5b62f54.css