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+%% Copyright (c) 2011, Loïc Hoguin <[email protected]>
+%% Copyright (c) 2011, Michiel Hakvoort <[email protected]>
+%%
+%% Permission to use, copy, modify, and/or distribute this software for any
+%% purpose with or without fee is hereby granted, provided that the above
+%% copyright notice and this permission notice appear in all copies.
+%%
+%% THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+%% WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+%% MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+%% ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+%% WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+%% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+%% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+%% @doc Cowboy protocol.
+%%
+%% A Cowboy protocol must implement one callback: <em>start_link/4</em>.
+%%
+%% <em>start_link/4</em> is meant for the initialization of the
+%% protocol process.
+%% It receives the pid to the listener's gen_server, the client socket,
+%% the module name of the chosen transport and the options defined when
+%% starting the listener. The <em>start_link/4</em> function must follow
+%% the supervisor start function specification.
+%%
+%% After initializing your protocol, it is recommended to wait to
+%% receive a message containing the atom 'shoot', as it will ensure
+%% Cowboy has been able to fully initialize the socket.
+%% Anything you do past this point is up to you!
+%%
+%% If you need to change some socket options, like enabling raw mode
+%% for example, you can call the <em>Transport:setopts/2</em> function.
+%% It is the protocol's responsability to manage the socket usage,
+%% there should be no need for an user to specify that kind of options
+%% while starting a listener.
+%%
+%% You should definitely look at the cowboy_http_protocol module for
+%% a great example of fast request handling if you need to.
+%% Otherwise it's probably safe to use <code>{active, once}</code> mode
+%% and handle everything as it comes.
+%%
+%% Note that while you technically can run a protocol handler directly
+%% as a gen_server or a gen_fsm, it's probably not a good idea,
+%% as the only call you'll ever receive from Cowboy is the
+%% <em>start_link/4</em> call. On the other hand, feel free to write
+%% a very basic protocol handler which then forwards requests to a
+%% gen_server or gen_fsm. By doing so however you must take care to
+%% supervise their processes as Cowboy only knows about the protocol
+%% handler itself.
+-module(cowboy_protocol).
+
+-export([behaviour_info/1]).
+
+%% @private
+-spec behaviour_info(_)
+	-> undefined | [{start_link, 4}, ...].
+behaviour_info(callbacks) ->
+	[{start_link, 4}];
+behaviour_info(_Other) ->
+	undefined.