= cowboy_protocol(3)

== Name

cowboy_protocol - HTTP protocol

== Description

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

== Types

=== opts() = [Option]

[source,erlang]
----
Option = {compress, boolean()}
	| {env, cowboy_middleware:env()}
	| {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_request_line_length, non_neg_integer()}
	| {middlewares, [module()]}
	| {onresponse, cowboy:onresponse_fun()}
	| {timeout, timeout()}
----

Configuration for the HTTP protocol handler.

This configuration is passed to Cowboy when starting listeners
using `cowboy:start_http/4` or `cowboy:start_https/4` functions.

It can be updated without restarting listeners using the
Ranch functions `ranch:get_protocol_options/1` and
`ranch:set_protocol_options/2`.

=== Option descriptions

The default value is given next to the option name.

compress (false)::
	When enabled, Cowboy will attempt to compress the response body.

env ([{listener, Ref}])::
	Initial middleware environment.

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_request_line_length (4096)::
	Maximum length of the request line.

middlewares ([cowboy_router, cowboy_handler])::
	List of middlewares to execute for every requests.

onresponse (undefined)::
	Fun called every time a response is sent.

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