cowboy/test/rest_simple_resource.erl

-module(rest_simple_resource).
-export([init/3, content_types_provided/2, get_text_plain/2]).

init(_Transport, _Req, _Opts) ->
	{upgrade, protocol, cowboy_http_rest}.

content_types_provided(Req, State) ->
	{[{{<<"text">>, <<"plain">>, []}, get_text_plain}], Req, State}.

get_text_plain(Req, State) ->
	{<<"This is REST!">>, Req, State}.