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Chromium Blog: Hello HTTP/2, Goodbye SPDY

HTTP

is the fundamental networking protocol that powers the web. The majority of sites use version 1.1 of HTTP, which was defined in 1999 with

RFC2616

. A lot has changed on the web since then, and a new version of the protocol named

HTTP/2

is well on the road to standardization. We plan to gradually roll out support for HTTP/2 in Chrome 40 in the upcoming weeks.

HTTP/2’s primary changes from HTTP/1.1 focus on improved performance. Some

key features

such as multiplexing, header compression, prioritization and protocol negotiation evolved from work done in an earlier open, but non-standard protocol named

SPDY

. Chrome has supported SPDY since Chrome 6, but since most of the benefits are present in HTTP/2, it’s time to say goodbye. We plan to remove support for SPDY in early 2016, and to also remove support for the TLS extension named

NPN

in favor of

ALPN

in Chrome at the same time. Server developers are strongly encouraged to

move to

HTTP/2 and ALPN.

We’re happy to have contributed to the open standards process that led to HTTP/2, and hope to see wide adoption given the broad industry engagement on standardization and implementation. We also look forward to further advancements in fundamental Internet protocols that lead to a faster and more secure Internet for everyone.

Posted by Chris Bentzel, Multiplexing Manager and Bence Bky, HTTP/2 Enabler

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