= cowboy_http(3)

== Name

cowboy_http - HTTP/1.1

== Description

The module `cowboy_http` implements HTTP/1.1 and HTTP/1.0
as a Ranch protocol.

== Options

// @todo Might be worth moving cowboy_clear/tls/stream_h options
// to their respective manual, when they are added.

[source,erlang]
----
opts() :: #{
    connection_type         => worker | supervisor,
    env                     => cowboy_middleware:env(),
    idle_timeout            => timeout(),
    inactivity_timeout      => timeout(),
    max_empty_lines         => non_neg_integer(),
    max_header_name_length  => non_neg_integer(),
    max_header_value_length => non_neg_integer(),
    max_headers             => non_neg_integer(),
    max_keepalive           => non_neg_integer(),
    max_method_length       => non_neg_integer(),
    max_request_line_length => non_neg_integer(),
    middlewares             => [module()],
    request_timeout         => timeout(),
    shutdown_timeout        => timeout(),
    stream_handlers         => [module()]
}
----

Configuration for the HTTP/1.1 protocol.

This configuration is passed to Cowboy when starting listeners
using `cowboy:start_clear/3` or `cowboy:start_tls/3` 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:

connection_type (supervisor)::
    Whether the connection process also acts as a supervisor.

env (#{})::
    Middleware environment.

idle_timeout (60000)::
    Time in ms with no data received before Cowboy closes the connection.

inactivity_timeout (300000)::
    Time in ms with nothing received at all before Cowboy closes the connection.

max_empty_lines (5)::
    Maximum number of empty lines before a request.

max_header_name_length (64)::
    Maximum length of header names.

max_header_value_length (4096)::
    Maximum length of header values.

max_headers (100)::
    Maximum number of headers allowed per request.

max_keepalive (100)::
    Maximum number of requests allowed per connection.

max_method_length (32)::
    Maximum length of the method.

max_request_line_length (8000)::
    Maximum length of the request line.

middlewares ([cowboy_router, cowboy_handler])::
    Middlewares to run for every request.

request_timeout (5000)::
    Time in ms with no requests before Cowboy closes the connection.

shutdown_timeout (5000)::
    Time in ms Cowboy will wait for child processes to shut down before killing them.

stream_handlers ([cowboy_stream_h])::
    Ordered list of stream handlers that will handle all stream events.

== Changelog

* *2.0*: The `timeout` option was renamed `request_timeout`.
* *2.0*: The `idle_timeout`, `inactivity_timeout` and `shutdown_timeout` options were added.
* *2.0*: The `max_method_length` option was added.
* *2.0*: The `max_request_line_length` default was increased from 4096 to 8000.
* *2.0*: The `connection_type` option was added.
* *2.0*: The `env` option is now a map instead of a proplist.
* *2.0*: The `stream_handlers` option was added.
* *2.0*: The `compress` option was removed in favor of the `cowboy_compress_h` stream handler.
* *2.0*: Options are now a map instead of a proplist.
* *2.0*: Protocol introduced. Replaces `cowboy_protocol`.

== See also

link:man:cowboy(7)[cowboy(7)],
link:man:cowboy_http2(3)[cowboy_http2(3)],
link:man:cowboy_websocket(3)[cowboy_websocket(3)]
