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The SPDY (pronounced speedy) protocol is an open-source, Transmission Control Protocol (TCP)-based, application layer protocol that transports content over the Web. Developed as an experimental protocol by Google's Chromium group in 2009, SPDY is primarily geared toward reducing Web page latency.
The Chromium project was initiated to achieve higher transmission speeds by rendering a single connection per client to prioritize and multiplex the file transmission process. The SPDY protocol is made up of a session layer on top of a secure shell (SSL), which facilitates multiple concurrent and interleaved streams over a TCP connection. SPDY defines a new framing format for encoding and transmitting data over the wire.
SPDY protocol features include:
Google's Chrome browser uses SPDY while communicating with Google services, such as Gmail, Google Search, Chrome Sync and Google ads.