anchor.diff:  
   -spec header({http_header, I::integer(), Field::http_header(), R::term(),
   	Value::string()} | http_eoh, Req::#http_req{}, State::#state{}) -> ok.
  -header({http_header, _I, 'Host', _R, Value}, Req, State) ->
  +header({http_header, _I, 'Host', _R, Value}, Req=#http_req{path=Path},
  +		State=#state{dispatch=Dispatch}) ->
   	Host = cowboy_dispatcher:split_host(Value),
  -	%% @todo We have Host and Path at this point, dispatch right away and
  -	%%       error_terminate(404) early if it fails.
  -	wait_header(Req#http_req{host=Host,
  -		headers=[{'Host', Value}|Req#http_req.headers]}, State);
  +	%% @todo We probably want to filter the Host and Path here to allow
  +	%%       things like url rewriting.
  +	case cowboy_dispatcher:match(Host, Path, Dispatch) of
  +		{ok, Handler, Opts, Binds} ->
  +			wait_header(Req#http_req{host=Host, bindings=Binds,
  +				headers=[{'Host', Value}|Req#http_req.headers]},
  +				State#state{handler={Handler, Opts}});
  +		{error, notfound} ->
  +			error_terminate(404, State)
  +	end;
   header({http_header, _I, 'Connection', _R, Connection}, Req, State) ->
   	wait_header(Req#http_req{
   		headers=[{'Connection', Connection}|Req#http_req.headers]},
  
positive.code: 	socket :: socket(),
  	transport :: module(),
  	dispatch :: dispatch(),
  	timeout :: timeout(),
  	connection = keepalive :: keepalive | close
  }).
  
negative.code: %% The Host header is required.
  header(http_eoh, #http_req{host=undefined}, State) ->
  	error_terminate(400, State);
  header(http_eoh, Req, State) ->
  	handler_loop(Req, State).
  
  -spec handler_loop(Req::#http_req{}, State::#state{}) -> ok.
  handler_loop(Req, State=#state{handler={Handler, Opts}}) ->
  	case Handler:handle(Opts, Req) of
  		{reply, RCode, RHeaders, RBody} ->
  			reply(RCode, RHeaders, RBody, State)
  		%% @todo stream_reply, request_body, stream_request_body...
  	end.
  
  -spec error_terminate(Code::http_status(), State::#state{}) -> ok.
  error_terminate(Code, State) ->
  