node.js - 重定向下referer的问题

Question

浏览器请求的'/'的时候，假如服务器重定向到'/test'，这个时候请求'/test'的headers里面会有referer吗？为什么？怎样可以让浏览器带上？

var express = require('express')
  , http = require('http')
  , path = require('path');

var app = express();

app.configure(function(){
  app.set('port', process.env.PORT || 8888);
  app.set('views', __dirname + '/views');
  app.set('view engine', 'jade');
  app.use(express.favicon());
  app.use(express.logger('dev'));
  app.use(express.bodyParser());
  app.use(express.methodOverride());
  app.use(app.router);
  app.use(express.static(path.join(__dirname, 'public')));
});

app.configure('development', function(){
  app.use(express.errorHandler());
});

app.get('/', function(req, res, next) {
  res.redirect('/test');
});

app.get('/test', function(req, res, next) {
  res.send(req.headers);
});

http.createServer(app).listen(app.get('port'), function(){
  console.log("Express server listening on port " + app.get('port'));
});

返回：

{
    host: "localhost:8888",
    connection: "keep-alive",
    user-agent: "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.4 (KHTML, like Gecko) Chrome/22.0.1229.79 Safari/537.4",
    accept: "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
    accept-encoding: "gzip,deflate,sdch",
    accept-language: "en-US,en;q=0.8,zh-CN;q=0.6,zh;q=0.4",
    accept-charset: "UTF-8,*;q=0.5",
    cookie:         "nd_secret=44f180cce9c8e88023d056a4b6a06a116d81dbf0de5c95349100946a3d6fbc294826df4b1bc4b5ba30927fb7002bd427;         connect.sid=s%3A0ajlt%2FaQVFfX%2Fn%2F7Bi%2Ffa%2B9z.3z9KvkiqVTozWD%2BMIm8XOOwzoINHTATA0pH7sYOeM7o"
}

Answer 1

和浏览器版本有关系，标准也并没有对此做出说明。
所以最好不要依赖referer，这也是为什么很多网站都会将源地址当作参数传过去。
参见这里

Answer 2

正确的做法是重定向时用/?from=/test这样的地址。浏览器的行为没有办法确定，况且还不一定是浏览器在发起HTTP请求，如果是搜索引擎spider或命令行的脚本呢？