SPDY (pronounced "speedy")[1] is a deprecated open specification networking protocol that was developed primarily at Google for transporting web content.

SPDY core developers were have been involved in the development of HTTP2, including both Mike Belshe and Roberto Peon. In February 2015, Google announced that following the recent final ratification of the HTTP2 standard, support for SPDY would be deprecated and Google removed SPDY support in Chrome 51. Mozilla removed it in Firefox 50

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