anchor.diff:  ,  m_http_with_header/1
   ,  m_http_with_payload/1
   ,  m_http_with_dsl/1
  +,  m_http_with_dsl_list_payload/1
   ]).
   
   %%%----------------------------------------------------------------------------   
  
positive.code: 
     {ok, 
        [
           {200, <<"OK">>, Head},
           ?ECHO
        ]
     } = m_http:once([m_http ||
  
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.
  