anchor.diff:  	socket :: socket(),
   	transport :: module(),
   	dispatch :: dispatch(),
  +	handler :: {Handler::module(), Opts::term()},
   	timeout :: timeout(),
   	connection = keepalive :: keepalive | close
   }).
  
positive.code: %% The Host header is required.
  header(http_eoh, #http_req{host=undefined}, State) ->
  	error_terminate(400, State);
  header(http_eoh, Req=#http_req{host=Host, path=Path},
  		State=#state{dispatch=Dispatch}) ->
  	%% @todo We probably want to filter the Host and Patch here to allow
  	%%       things like url rewriting.
  	dispatch(cowboy_dispatcher:match(Host, Path, Dispatch), Req, State).
  
  -spec dispatch({ok, Handler::module(), Opts::term(), Binds::bindings()}
  	| {error, notfound}, Req::#http_req{}, State::#state{}) -> ok.
  dispatch({ok, Handler, Opts, Binds}, Req, State) ->
  	case Handler:handle(Opts, Req#http_req{bindings=Binds}) of
  		{reply, RCode, RHeaders, RBody} ->
  			reply(RCode, RHeaders, RBody, State)
  		%% @todo stream_reply, request_body, stream_request_body...
  	end;
  dispatch({error, notfound}, _Req, State) ->
  	error_terminate(404, State).
  
  -spec error_terminate(Code::http_status(), State::#state{}) -> ok.
  error_terminate(Code, State) ->
  
negative.code: 
  -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=#http_req{path=Path},
  		State=#state{dispatch=Dispatch}) ->
  	Host = cowboy_dispatcher:split_host(Value),
  	%% @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]},
  