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= cowboy_stream_h(3)

== Name

cowboy_stream_h - Default stream handler

== Description

The module `cowboy_stream_h` is Cowboy's default stream
handler and defines much of its behavior. It is responsible
for managing the request process, sending it the request
body and translating its messages into commands that
Cowboy understands.

== Options

[source,erlang]
----
opts() :: #{
    env              => cowboy_middleware:env(),
    middlewares      => [module()],
    shutdown_timeout => timeout()
}
----

Configuration for the default stream handler.

The default value is given next to the option name:

env (#{})::

Middleware environment.

middlewares ([cowboy_router, cowboy_handler])::

Middlewares to run for every request.

shutdown_timeout (5000)::

Time in ms Cowboy will wait for child processes to shut down before killing them.

== Events

The default stream handler spawns the request process
and receives its exit signal when it terminates. It
will stop the stream once its receives it.

// @todo It also implements the read_body mechanism.
// Note that cowboy_stream_h sends the 100-continue automatically.

In addition it returns a command for any event message
looking like one of the following commands: `inform`,
`response`, `headers`, `data`, `trailers`, `push`,
`switch_protocol`. This is what allows the request
process to send a response.

// @todo Add set_options, which updates options dynamically.

Because this stream handler converts events from the
request process into commands, other stream handlers
may not work properly if they are executed

== Changelog

* *2.0*: Module introduced.

== See also

link:man:cowboy(7)[cowboy(7)],
link:man:cowboy_stream(3)[cowboy_stream(3)],
link:man:cowboy_compress_h(3)[cowboy_compress_h(3)],
link:man:cowboy_metrics_h(3)[cowboy_metrics_h(3)],
link:man:cowboy_tracer_h(3)[cowboy_tracer_h(3)]