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= cowboy_http2(3)
== Name
cowboy_http2 - HTTP/2
== Description
The module `cowboy_http2` implements HTTP/2
as a Ranch protocol.
== Options
[source,erlang]
----
opts() :: #{
env := cowboy_middleware:env(),
middlewares := [module()],
preface_timeout := timeout()
}
----
Configuration for the HTTP/2 protocol.
This configuration is passed to Cowboy when starting listeners
using `cowboy:start_clear/4` or `cowboy:start_tls/4` functions.
It can be updated without restarting listeners using the
Ranch functions `ranch:get_protocol_options/1` and
`ranch:set_protocol_options/2`.
The default value is given next to the option name:
env (#{})::
Middleware environment.
middlewares ([cowboy_router, cowboy_handler])::
Middlewares to run for every request.
preface_timeout (5000)::
Time in ms Cowboy is willing to wait for the connection preface.
== Changelog
* *2.0*: Protocol introduced.
== See also
link:man:cowboy(7)[cowboy(7)],
link:man:cowboy_http(3)[cowboy_http(3)],
link:man:cowboy_websocket(3)[cowboy_websocket(3)]
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