SPDY for CDN: how does it work?

Recently, Google specialists have been working on SPDY – an open networking protocol that servers to transfer web content. Being comprised from the word “speedy”, it aims to reduce latency of page loading. Google’s developers claim that widespread CDN adoption of SPDY would be beneficial both for optimization and convenience of end users

According to developers’ idea, SPDY replaces some parts of HTTP protocol, such as connection control and data transfer format. It lowers latency through prioritization, multiplexing and compression, though sometimes these processes are defined by deployment conditions of website and network. Thus, SPDY changes the way HTTP sends requests and responses over the wire.

To test the protocol, specialists imitated a network and loaded 25 biggest world sites via SPDY. According to the results, the speed of loading was 55% higher than with HTTP and general time of page loading reduced by 36%.

In the end of 2014, almost 2,5% of all sites supported SPDY and it was implemented in the most popular browsers. Despite being regarded as high-potential, most developers started preferring HTTP/2 to this protocol, so it’s future is still unclear.

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