headertest.js

var net=require('net'),
    express = require('express'),
    app = express();

app.get('*', function(req,res){
    var filename='中文名.js';
    //filename=new Buffer(filename).toString('binary');
    console.log('before download: %s',unicode(filename));
    res.download(__filename,filename);
});
app.listen(8080, function(){
    console.log("listening on port %d", this.address().port);

    var client=net.connect(8080,function(){
        client.write('GET / HTTP/1.1\r\nHost:localhost\r\n\r\n');
    });
    client.once('data',function(chunk){
        var s=chunk.toString('binary'),
            i=s.indexOf('"'),
            j=s.indexOf('"',i+1);
        console.log('after  download: %s',unicode(s.substring(i+1,j)));
        process.exit(0);
    });
});

function unicode(s){
    var f='';
    [].forEach.call(s,function(e){
        f+='\\x'+e.charCodeAt().toString(16)+'\t';
    })
    return f
}