anchor.diff:  
      {ok, 
         [
  -         {200, <<"OK">>, Head},
  +         {200, <<"OK">>, _Head},
            ?ECHO
         ]
      } = m_http:once([m_http ||
  
positive.code: 
     knet_mock_tcp:free().
  
  
  
  %%%----------------------------------------------------------------------------   
  
negative.code:       <<"HTTP/1.1 200 OK\r\n">>, 
        <<"Content-Length: 10\r\n\r\n">>,
        ?ECHO
     ];
  postman(<<"[\"0123456789\"]">>) ->
     [
        <<"HTTP/1.1 200 OK\r\n">>, 
        <<"Content-Length: 10\r\n\r\n">>,
        ?ECHO
     ];
  postman(_) ->
     undefined.
  