cowboy/examples/error_hook/src/error_hook_responder.erl

%% Feel free to use, reuse and abuse the code in this file.

-module(error_hook_responder).

-export([respond/4]).

respond(404, Headers, <<>>, Req) ->
	{Path, Req2} = cowboy_req:path(Req),
	Body = <<"404 Not Found: \"", Path/binary, "\" is not the path you are looking for.\n">>,
	Headers2 = lists:keyreplace(<<"content-length">>, 1, Headers,
		{<<"content-length">>, integer_to_list(byte_size(Body))}),
	{ok, Req3} = cowboy_req:reply(404, Headers2, Body, Req2),
	Req3;
respond(Code, Headers, <<>>, Req) when is_integer(Code), Code >= 400 ->
	Body = ["HTTP Error ", integer_to_list(Code), $\n],
	Headers2 = lists:keyreplace(<<"content-length">>, 1, Headers,
		{<<"content-length">>, integer_to_list(iolist_size(Body))}),
	{ok, Req2} = cowboy_req:reply(Code, Headers2, Body, Req),
	Req2;
respond(_Code, _Headers, _Body, Req) ->
	Req.