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SPDY, an experiemental web protocol to speed up HTTP

Page loading and latency are two of the important parameters in web traffic. If your page does not load under something like 4 sec, the surfer will go elsewhere. SPDY is all about reducing the page loading and improving latency. SPDY is a Google trade mark and it is still in experimentation.

Read this White paper to get a feeling for what is brewing:

SPDY modifies the HTTP rather than replacing it and functions at the Session level. It functions as a tunnel for HTTP and HTTPs requests. HTTP 2.0 which in the works takes SPDY as a starting point.

Source: white paper

Basic Features(Google white Paper)
  • Multiplexed Streams
  • Request prioritization
  • HTTP Header compression
Google will try to get it standardized (in the works) and implementations exist for Chromium, Mozilla Firefox, Opera and other browsers including IE.

How is the speed achieved?
Latency reduction is acheived through compression, mulitplexing and prioritization (Basic features). The multiplexing is carried over one client connection for subweb resources instead of HTTP fetching one resource per connection.

Well how does HTTP with SPDY compares with HTTP?

Well web pages are complex constructs with images; style sheets; media etc fetched through connections slow and fast. It appears SDPY would work faster than HTTP in most cases.
Here is the performance comparison table from Google whitepaper:

Microsoft is also looking at SPDY and here is link to Microsoft research on comparing HTTP with SPDY and HTTP:

Here is a performance chart for a popular web site (from Microsoft's PDF above):

Well we want to surf faster and with our Smartphones to get the same experience like the one on desktop something has to change.

Read the original blog entry...

More Stories By Jayaram Krishnaswamy

Jayaram Krishnaswamy is a technical writer, mostly writing articles that are related to the web and databases. He is the author of SQL Server Integration Services published by Packt Publishers in the UK. His book, 'Learn SQL Server Reporting Services 2008' was also published by Packt Publishers Inc, Birmingham. 3. "Microsoft SQL Azure Enterprise Application Development" (Dec 2010) was published by Packt Publishing Inc. 4. "Microsoft Visual Studio LightSwitch Business Application Development [Paperback] "(2011) was published by Packt Publishing Inc. 5. "Learning SQL Server Reporting Services 2012 [Paperback]" (June 2013) was Published by Packt Publishing Inc. Visit his blogs at: He writes articles on several topics to many sites.

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