require html page by nodejs

gistfile1.txt

var http = require('http');
var fs = require('fs');
　　　
var req = http.request({
		host: 'www.bbc.com'
	}, function(res) {　　　
		var arr = [],
			len = 0,
			totalLen=0;
		res.on('data', function(data) {
			console.log(data);
			len++;
			arr.push(data);
			totalLen += data.length;
		});
		res.on('end', function() {
			var buffer = new Buffer(totalLen);
			for(var i = 0, pos = 0; i < len; i++) {
		   var chunk = arr[i];
		   chunk.copy(buffer, pos);
		   pos += chunk.length;
			}

			fs.writeFile('file.txt',buffer);
		});
	});
req.end();