anchor.diff:          true ->
             case whereis(webmachine_perf_logger) of
               undefined ->
  -              application:set_env(webmachine, enable_perf_logger, true),
  +              application_set_unless_env(webmachine, enable_perf_logger, true),
                 webmachine_sup:start_perf_logger(LogDir);
               _ ->
                 ignore
  
positive.code: get_option(Option, Options) ->
      {proplists:get_value(Option, Options), proplists:delete(Option, Options)}.
  
  host_headers(Req) ->
      [ V || {V,_ReqState} <- [Req:get_header_value(H)
                               || H <- ["x-forwarded-host",
  
negative.code:       {undefined, _} -> {?MODULE, Options4};
        {PN, O5} -> {PN, O5}
      end,
      application_set_unless_env(webmachine, dispatch_list, DispatchList),
      application_set_unless_env(webmachine, error_handler, ErrorHandler),
      mochiweb_http:start([{name, PName}, {loop, fun loop/1} | Options5]).
  
  stop() ->
  