anchor.diff:  
   all() -> [ accept_get_normal
            , accept_get_history_all
  -         , accept_get_longpoll
            , accept_get_longpoll_heartbeat
            , accept_get_eventsource
            , reject_store_unknown
  
positive.code: 
  -export([ accept_get_normal/1
          , accept_get_history_all/1
          , accept_get_longpoll/1
          , accept_get_longpoll_heartbeat/1
          , accept_get_eventsource/1
          , reject_store_unknown/1
  
negative.code:             end,
    Headers = [{<<"Content-Type">>, <<"application/json">>},
               {<<"A-IM">>, <<"Incremental feed">>}],
  
    {ok, ClientRef} = hackney:get(Url, Headers, <<>>, Opts),
    CatRevId = put_cat(),
    {ok, NbHeartBeats1} = LoopFun(LoopFun, {ClientRef, 0}),
    true = NbHeartBeats1 >= 1,
  
    Url2 = <<Url/binary, "&since=1">>,
    {ok, ClientRef2} = hackney:get(Url2, Headers, <<>>, Opts),
    delete_cat(CatRevId),
    {ok, NbHeartBeats2} =  LoopFun(LoopFun, {ClientRef2, 0}),
    true = NbHeartBeats2 >= 1,
    ok.
  
  %%=======================================================================
  