%% 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.