Question

我尝试从www重定向到非www，但不能。看看我的代码：

function wwwRedirect(req, res, next) {
  console.log('Got url ' + req.headers.host)  // return example.com (without 'www'), even if I go to www.example.com
  console.log('req.get("host") ' + req.get('host')) // same
  if (req.headers.host.slice(0, 4) === 'www.') { // not working, cause req.headers.host doesn't contain 'www', even if Im connecting to www.example.com
      var newHost = req.headers.host.slice(4);
      return res.redirect(301, req.protocol + '://' + newHost + req.originalUrl);
      console.log('New url ' + req.protocol + '://' + newHost + req.originalUrl)
  }
  next();
};

app.set('trust proxy', true);
app.use(wwwRedirect);

请查看上面的所有评论。所以，我无法进行重定向。我究竟做错了什么？为什么req.headers.host不包含＆＃39; www。＆＃39;即使我与www.example.com＆＃39;

联系

Answer 1

您可以这样做：

app.use(function(req, res, next) {
  if (req.headers.host.match(/^www/) !== null ) {
    res.redirect('http://' + req.headers.host.replace(/^www\./, '') + req.url);
  } else {
    next();     
  }
})

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