anchor.diff:      false;
   is_prefix(_, _) ->
       false.
  -
  
positive.code:     add_headers(T, undefined, undefined, Connection,
          [[H, <<": ">>, V, ?HTTP_LINE_END] | Acc]);
  add_headers([{H, V} | T], Body, Host, Connection, Acc) ->
      case bin_to_lower(H) of
          <<"connection">> ->
              add_headers(T, Body, Host, V,
                  [[H, <<": ">>, V, ?HTTP_LINE_END] | Acc]);
  
negative.code: %% @doc Converts characters in a string ro lower case.
  %% @end
  %%------------------------------------------------------------------------------
  -spec to_lower(unicode:chardata()) -> unicode:chardata().
  to_lower(String) ->
      string:lowercase(String).
  
  %%------------------------------------------------------------------------------
  %% @doc Compares header values to pre-defined values
  