SPDY and HTTP/2

The SPDY protocol was developed by Google to accelerate the web browsing experience. There are currently four drafts; the final one supported in NGINX labeled Draft 3.1. NGINX supported this draft as of version 1.5.10.

The protocol developers also had a hand in the ratification of HTTP/2. SPDY has since been deprecated; all support for it will end in 2016. It is superseded by HTTP version 2 (HTTP/2), which NGINX has supported since version 1.9.5.

Support for HTTP/2 can be activated by including the compile-time flag, --with-http_v2_module. This will make the following directives available for configuration:

HTTP/2 directives	Explanation
http2_chunk_size	This directive sets the maximum chunk size for the response body.
http2_idle_timeout	This directive specifies the amount of time with no activity after which the connection is closed.
http2_max_concurrent_streams	This directive sets the number of HTTP/2 streams that may be active in a single connection.
http2_max_field_size...