SPDY:Experimental Protocol for faster web

It is under Chromium Project.

SPDY--

SPDY (pronounced "SPeeDY") is an application-layer protocol for transporting content over the web, designed specifically for minimal latency.In lab tests, the performance of these applications are compared over HTTP and SPDY, and have observed up to 64% reductions in page load times in SPDY.

Some of the features of HTTP that inhibit optimal performance:

• Single request per connection.
  
• Exclusively client-initiated requests.
  
• Redundant headers.
  
• Optional data compression.

Goals for SPDY--

The SPDY project defines and implements an application-layer protocol for the web which greatly reduces latency. The high-level goals for SPDY are:

• To target a 50% reduction in page load time. Our preliminary results have come close to this target (see below).
• To minimize deployment complexity. SPDY uses TCP as the underlying transport layer, so requires no changes to existing networking infrastructure.
• To avoid the need for any changes to content by website authors. The only changes required to support SPDY are in the client user agent and web server applications.
• To bring together like-minded parties interested in exploring protocols as a way of solving the latency problem. We hope to develop this new protocol in partnership with the open-source community and industry specialists.

Some specific technical goals are:

• To allow many concurrent HTTP requests to run across a single TCP session.

• To reduce the bandwidth currently used by HTTP by compressing headers and eliminating unnecessary headers.

• To define a protocol that is easy to implement and server-efficient. We hope to reduce the complexity of HTTP by cutting down on edge cases and defining easily parsed message formats.

• To make SSL the underlying transport protocol, for better security and compatibility with existing network infrastructure. Although SSL does introduce a latency penalty, we believe that the long-term future of the web depends on a secure network connection. In addition, the use of SSL is necessary to ensure that communication across existing proxies is not broken.
• To enable the server to initiate communications with the client and push data to the client whenever possible.

SPDY FEATURES--

SPDY adds a session layer atop of SSL that allows for multiple concurrent, interleaved streams over a single TCP connection.

The usual HTTP GET and POST message formats remain the same; however, SPDY specifies a new framing format for encoding and transmitting the data over the wire.