node.js经典示例奇怪的行为

Question

there is classic node example:

var http = require('http');
var s = http.createServer(function(req, res){
    res.writeHead(200, {'content-type':'text/plain'});
    res.write('hi there\n');
    setTimeout(function(){
        res.end('and here');
    },2000);
});
s.listen(8000);

and when i run

curl http://127.0.0.1:8000

its going fine, "hi there" and over 2 sec - "and here". ok.

but when i change the string#4 and remove \\n:

 res.write('hi there');

i see delay (2sec) and simultaneously output without any timeout between "hi there" and "and here"

node -v = 4.2.6

this is good, this is bad or this is unimportant?

Answer 1

It seems to be browser specific behavior. firefox shows the data immediately while chrome seems to buffer and wait until the response is ended.

Answer 2

答案似乎在注释中： it's a line-wise buffer, a buffer that flushes when it sees a line terminator.