anchor.diff:  %%
   %%
   down_link_return(Pipe, #http{is = eoh, state = State}) ->
  -   %% htstream has a feature of "eoh event". 
  +   %% htstream has a feature of "eoh event".
      down_link([], Pipe, State);
   
   down_link_return(_Pipe, #http{state = State}) ->
  
positive.code: lens_http_socket_peername() ->
     lens:c([lens:tuple(#http.state), lens_socket_peername()]).
  
  
  
  %%
  
negative.code:    #req{
        http = Ht,
        treq = T
     } = lens:get(lens_http_queue(), Http),
     Uri = uri_at_req(Ht),
     knet_log:trace(Pid, {http, {code, Uri},  Code}),
     knet_log:trace(Pid, {http, {ttfb, Uri}, tempus:diff(T)}),
  