* Version 3.1: SPDY v3.1 introduced support for session-layer flow control, and removed the CREDENTIALS frame (and associated error codes). Firefox 27 has added SPDY 3.1 support. OpenLiteSpeed 1.2.7 introduces SPDY/3.1 support. Nginx 1.5.10 supports SPDY/3.1. F5 BIGIP 11.6 supports SPDY/3.1.
* Version 4.0: SPDY v4 alpha3 is more closely aligned with the HTTP/2 draft; it has a new stream flow control and error codes unified with the HTTP/2 draft.

Design

The goal of SPDY is to reduce web page load time. This is achieved

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