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HTTP/2 replaces SPDY/3

Microsoft Edge removes support for the experimental SPDY/3 protocol and implements the HTTP/2 standard.

TCP Connection Sharing (also known as SPDY/3) was an experimental precursor to HTTP/2 that implemented some network use optimizations. It is being removed.

HTTP/2 will be used by Microsoft Edge on SSL/TLS connections (https) when supported by the host server. Microsoft Edge will fall back to HTTP/1.1 when HTTP/2 is not available or the connection is not secure.

Client-side developers will see HTTP/2 noted in the F12 developer tools Network tool where applicable.

[IE Blog] HTTP/2: The Long-Awaited Sequel