TCP, HTTP and SPDY Deep Dive
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This course will tell you how TCP and HTTP (the transport and presentation-layer protocols used by web-based applications) impact the web application responsiveness and page load time.
We'll look at waterfall diagrams created by web browser development tools, cover the intricate details of TCP and HTTP (including slow start, congestion windows and pipelining), and try to figure out whether SPDY (the next-generation HTTP from Google) makes sense.
The course is delivered via short video lectures in which I gradually expose the problems your web browser faces when trying to fetch all components of a web site, and the solutions you could use to make the process faster.
You can take your time and go at your own pace, or rush through the course and be done in an hour or two. However, I would encourage you to proceed slowly, build your own test environment (using your mobile device or WAN emulator like WANem) and explore what's going on behind the scenes with browser development tools and Wireshark.</p>
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|Section 1: Impact of TCP and HTTP on web application performance|
In the ideal world, you’d get a new web page within 100 milliseconds of clicking an active web page component (link, button ...). Reality is way harsher – sometimes it takes seconds till you can enjoy a web page served from a well-behaved web server (let’s pretend there are no server performance issues).
In this lecture you'll learn how the network transport mechanisms (TCP and HTTP) impact web application performance and what you can do to improve it.
This lecture is a deep dive into actual TCP and HTTP mechanisms that increase end-to-end latency (TCP 3-way handshake, initial congestion window, request/response nature of HTTP).
The TCP and HTTP deep dive lecture triggered numerous questions during the live webinar session – it took me almost 10 minutes to answer them all.
|Section 2: Improving TCP and HTTP|
|Web browsers use parallel TCP sessions and some servers increase initial congestion window to alleviate TCP drawbacks. These mechanisms work quite well ... but what about HTTP persistent sessions and pipelining? Do they make sense? You'll discover some interesting answers in this lecture.|
|SPDY is Google’s new session-layer protocol and candidate for next-generation HTTP. It's already available on popular web servers and browsers, and used by some high-volume web sites. But is it as fast as its name would indicate? This lesson will help you get fluent in SPDY.|
|Section 3: Conclusions|
|Can you do something to cope with the TCP and HTTP behavior you've discovered throughout this course? Can we test our web applications under realistic conditions? Is cache really the king? The last lecture in this course will give you the answers to these (and a few other) questions.|
Ivan Pepelnjak, CCIE#1354 Emeritus, is the chief technology advisor at NIL Data Communications. He has been designing and implementing large-scale service provider and enterprise networks as well as teaching and writing books about advanced technologies since 1990. He’s author of several Cisco Press books, prolific blogger and writer, occasional consultant, and author of a series of highly successful webinars.