nodejs stream tail -f to web browser

node-tail-f.js

var express = require('express'), spawn = require('child_process').spawn;

var app = express.createServer();
app.use(app.router);

var tail;
app.get('/tail', function(req, res) {
	res.header('Content-Type','text/html;charset=utf-8');
	
	tail = spawn('tail', ['-f', './test.log']);
	tail.stdout.on('data', function(data) {
		console.log('stdout: ' + data);
		res.write(data, 'utf-8');
	});
	tail.stderr.on('data', function(data) {
		console.log('stderr: ' + data);
		res.write(data, 'utf-8');
	});
	tail.on('exit', function(code) {
		console.log('child process exited with code ' + code);
		res.end(code);
	});
});
app.listen(8080);
console.log('server ' + process.pid + ' running on 8080 port...');

var http = require('http'), spawn = require('child_process').spawn;
http.createServer(function(req, res) {
if(req.url === '/tail'){
res.header('Content-Type' , 'text/html;charset=utf-8');

tail = spawn('tail', ['-f', './test.log']);
tail.stdout.pipe(res);

}
}).listen(8081);

nodejs chunked 输出时'Content-Type'头必须有charset,如'Content-Type': 'text/html;charset=utf-8' ,否则浏览器不渲染. 和数据是否有1024字节没有关系,firefox11.0, chrome18.0.1025.162, IE6下测试过