SPDY
- 1. SPDY Up to 11 LINKed Together 2012 Gavin Thirlwall Support Engineer COMPUTERLINKS UK [email protected]
- 2. Why is it called SPDY? “We wanted a name that captures speed. SPDY, pronounced "SPeeDY", captures this and also shows how compression can help improve speed.”
- 3. OK, so What is it? • “An experimental protocol for a faster web” • Developed primarily by Google • Improves on problems that make HTTP slow and inefficient for modern websites • Sits on top of TCP and SSL • Requires support from both the client (browser) and server
- 4. What problems does it solve? • Websites are now made of hundreds of objects • Each object has a large header request • We can only request a small number of objects at a time • Average web page size is increasing – now around 1.1MB • Users are as demanding as ever… • … and they are using mobile devices with high latency 500 millisecond delay caused 100 millisecond delay caused 20% traffic decrease. 1% drop in revenue.
- 6. What does it do? • Mandates the use of SSL Although SSL adds latency in general, SPDY connections should still be faster. • Allows multiple simultaneous HTTP requests to share a single TCP connection Not pipelining. Avoids the latency of setting up multiple TCP sessions. Requests can be prioritised. • HTTP Header Compression • Server Initiated Connections Server push Server hint (X-Associated-Content) • Reduces page load time by 30-45% without changing the page
- 7. Web Clients Applications HTTP HTTP Web Clients Applications One SPDY TCP Connection SPDY
- 8. How do I use SPDY? • Use a SPDY Browser… • You probably already are and don’t realise it. • and SPDY Web Server… • More difficult at the moment… • Apache (mod_spdy), NginX and others are all working on mainstream support. • GMail, Google Ads and Twitter are already using SPDY when available.
- 9. I can’t change my web server… • I’ll lose application support • It’s disruptive • I need six months of QA • I use a lame application like Oracle or SAP
- 10. Use a SPDY Gateway • Keep your lame application server • Use a reverse proxy • In BIG-IP 11.2 (out a few days ago) but requires a SPDY licence key USERS DATACENTER INTERNET … BIG-IP SDPY SPDY GATEWAY HTTP • No doubt other vendors will follow
- 11. That’s It! • See http://www.chromium.org/spdy for more information • These slides will be available via the internal Wiki shortly • Email me if you want the F5 SPDY Implementation Guide