SPDY

This article is about the communications protocol. For the standard for describing software bills of materials, see SPDX.
Internet protocol suite
Application layer
Transport layer
Internet layer
Link layer

SPDY (pronounced "speedy")[1] is an obsolete open-specification communication protocol developed for transporting web content.[1] SPDY became the basis for HTTP/2 specification. However, HTTP/2 diverged from SPDY and eventually HTTP/2 subsumed all usecases of SPDY.[2] After HTTP/2 was ratified as a standard, major implementers, including Google, Mozilla, and Apple, deprecated SPDY in favor of HTTP/2. Since 2021, no modern browser supports SPDY.

Google announced SPDY in late 2009 and deployed in 2010. SPDY manipulates HTTP traffic, with particular goals of reducing web page load latency and improving web security. SPDY achieves reduced latency through compression, multiplexing, and prioritization,[1] although this depends on a combination of network and website deployment conditions.[3][4][5] The name "SPDY" is not an acronym.[6]

  1. ^ a b c Cite error: The named reference SPDY white paper was invoked but never defined (see the help page).
  2. ^ "HTTP/2 Frequently Asked Questions". http2.github.io.
  3. ^ Elkhatib, Yehia; Tyson, Gareth; Welzl, Michael (2014). 2014 IFIP Networking Conference. pp. 1–9. CiteSeerX 10.1.1.698.2343. doi:10.1109/IFIPNetworking.2014.6857089. ISBN 978-3-901882-58-6. S2CID 13841087.
  4. ^ Podjarny, Guy. "Not as SPDY as You Thought". Archived from the original on 12 October 2012. Retrieved 12 October 2012.
  5. ^ Abdelsalam, Ahmed; Celandroni, Nedo; Collina, Matteo; Cruickshank, Haitham; Fairhurst, Gorry; Ferro, Erina; Gotta, Alberto; Luglio, Michele; Roseti, Cesare (2015-07-01). "A deep analysis on future web technologies and protocols over broadband GEO satellite networks". International Journal of Satellite Communications and Networking. 33 (5): 451–472. doi:10.1002/sat.1120. ISSN 1542-0981.
  6. ^ "SPDY frequently asked questions". The Chromium Projects. Retrieved 2015-02-23. We wanted a name that captures speed. SPDY, pronounced "SPeeDY", captures this and also shows how compression can help improve speed.