anchor.diff:  -export([
     app_id/0,
     data_perms/0,
  -  login_redirect_uri/0
  +  login_redirect_uri/0,
  +  main/0
   ]).
   
   -include_lib("nitrogen_core/include/wf.hrl").
  
positive.code: 
  login_redirect_uri() ->
    mtc:get_env(url, "http://metalkia.com") ++ "/facebook".
  
negative.code:   RequestBridge = simple_bridge:make_request(webmachine_request_bridge, Req),
    ResponseBridge = simple_bridge:make_response(webmachine_response_bridge, Req),
    nitrogen:init_request(RequestBridge, ResponseBridge),
  
    [nitrogen:handler(Handler, PageModule) ||
    Handler <- [
        mt_session_handler,
        mt_security_handler,
        mt_route_handler,
        mt_identity_handler
    ]],
  
    PostParams = RequestBridge:post_params(),
    ?DBG("POST Params:~n~p", [PostParams]),
  
    GetParams = RequestBridge:query_params(),
    ?DBG("GET Params:~n~p", [GetParams]),
  
    PathInfo = wrq:path_info(Req),
    wf_context:path_info(PathInfo),
  