anchor.diff:  generate_etag(Req, State) ->
   	{undefined, Req, State}.
   
  -
   %% @private Return the content type of a file.
   -spec content_types_provided(cowboy_req:req(), #state{}) -> tuple().
   content_types_provided(Req, #state{filepath=Filepath,
  
positive.code: 		nomatch -> check_path(T)
  	end.
  
  
  %% @private Join the the directory and request paths.
  -spec join_paths(dirpath(), [binary()]) -> binary().
  join_paths([H|_]=Dirpath, Filepath) when is_integer(H) ->
  
negative.code: 	end,
  	{{stream, Filesize, Writefile}, Req, State}.
  
  -spec directory_path(dirspec()) -> dirpath().
  directory_path({priv_dir, App, []}) ->
  	priv_dir_path(App);
  