如何在 Express 中获取完整 URL？

Question

Let's say my sample URL is

http://example.com/one/two

and I say I have the following route

app.get('/one/two', function (req, res) {
    var url = req.url;
}

The value of url will be /one/two .

How do I get the full URL in Express? For example, in the case above, I would like to receive http://example.com/one/two .

Answer 1

1. The protocol is available as req.protocol . docs here

   1. Before express 3.0, the protocol you can assume to be http unless you see that req.get('X-Forwarded-Protocol') is set and has the value https , in which case you know that's your protocol

2. The host comes from req.get('host') as Gopal has indicated

3. Hopefully you don't need a non-standard port in your URLs, but if you did need to know it you'd have it in your application state because it's whatever you passed to app.listen at server startup time. However, in the case of local development on a non-standard port, Chrome seems to include the port in the host header so req.get('host') returns localhost:3000 , for example. So at least for the cases of a production site on a standard port and browsing directly to your express app (without reverse proxy), the host header seems to do the right thing regarding the port in the URL.

4. The path comes from req.originalUrl (thanks @pgrassant). Note this DOES include the query string. docs here on req.url and req.originalUrl . Depending on what you intend to do with the URL, originalUrl may or may not be the correct value as compared to req.url .

Combine those all together to reconstruct the absolute URL.

  var fullUrl = req.protocol + '://' + req.get('host') + req.originalUrl;

Answer 2

Instead of concatenating the things together on your own, you could instead use the node.js API for URLs and pass URL.format() the informations from express.

Example:

var url = require('url');

function fullUrl(req) {
  return url.format({
    protocol: req.protocol,
    host: req.get('host'),
    pathname: req.originalUrl
  });
}

Answer 3

I found it a bit of a PITA to get the requested url. I can't believe there's not an easier way in express. Should just be req.requested_url

But here's how I set it:

var port = req.app.settings.port || cfg.port;
res.locals.requested_url = req.protocol + '://' + req.host  + ( port == 80 || port == 443 ? '' : ':'+port ) + req.path;

Answer 4

Here is a great way to add a function you can call on the req object to get the url

  app.use(function(req, res, next) {
    req.getUrl = function() {
      return req.protocol + "://" + req.get('host') + req.originalUrl;
    }
    return next();
  });

Now you have a function you can call on demand if you need it.

Answer 5

Using url.format :

var url = require('url');

This support all protocols and include port number. If you don't have a query string in your originalUrl you can use this cleaner solution:

var requrl = url.format({
    protocol: req.protocol,
    host: req.get('host'),
    pathname: req.originalUrl,
});

If you have a query string:

var urlobj = url.parse(req.originalUrl);
urlobj.protocol = req.protocol;
urlobj.host = req.get('host');
var requrl = url.format(urlobj);

Answer 6

make req.host/req.hostname effective must have two condition when Express behind proxies :

1. app.set('trust proxy', 'loopback'); in app.js
2. X-Forwarded-Host header must specified by you own in webserver. eg. apache, nginx

nginx :

server {
    listen myhost:80;
    server_name  myhost;
    location / {
        root /path/to/myapp/public;
        proxy_set_header X-Forwarded-Host $host:$server_port;
        proxy_set_header X-Forwarded-Server $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_pass http://myapp:8080;
    }
}

apache :

<VirtualHost myhost:80>
    ServerName myhost
    DocumentRoot /path/to/myapp/public
    ProxyPass / http://myapp:8080/
    ProxyPassReverse / http://myapp:8080/
</VirtualHost>

Answer 7

用这个，

var url = req.headers.host + '/' + req.url;

Answer 8

Just the code below was enough for me!

const baseUrl = `${request.protocol}://${request.headers.host}`;
// http://127.0.0.1:3333

Answer 9

var full_address = req.protocol + "://" + req.headers.host + req.originalUrl;

要么

var full_address = req.protocol + "://" + req.headers.host + req.baseUrl;

Answer 10

You need to construct it using req.headers.host + req.url . Of course if you are hosting in a different port and such you get the idea ;-)

Answer 11

I would suggest using originalUrl instead of URL:

var url = req.protocol + '://' + req.get('host') + req.originalUrl;

See the description of originalUrl here: http://expressjs.com/api.html#req.originalUrl

In our system, we do something like this, so originalUrl is important to us:

  foo = express();
  express().use('/foo', foo);
  foo.use(require('/foo/blah_controller'));

blah_controller looks like this:

  controller = express();
  module.exports = controller;
  controller.get('/bar/:barparam', function(req, res) { /* handler code */ });

So our URLs have the format:

www.example.com/foo/bar/:barparam

Hence, we need req.originalUrl in the bar controller get handler.

Answer 12

我的代码看起来像这样，

params['host_url'] = req.protocol + '://' + req.headers.host + req.url;

Answer 13

You can use this function in the route like this

app.get('/one/two', function (req, res) {
    const url = getFullUrl(req);
}

/**
 * Gets the self full URL from the request
 * 
 * @param {object} req Request
 * @returns {string} URL
 */
const getFullUrl = (req) => `${req.protocol}://${req.headers.host}${req.originalUrl}`;

req.protocol will give you http or https, req.headers.host will give you the full host name like www.google.com, req.originalUrl will give the rest pathName (in your case /one/two )

Answer 14

I use the node package 'url' (npm install url)

What it does is when you call

url.parse(req.url, true, true)

it will give you the possibility to retrieve all or parts of the url. More info here: https://github.com/defunctzombie/node-url

I used it in the following way to get whatever comes after the / in http://www.example.com/ to use as a variable and pull up a particular profile (kind of like facebook: http://www.facebook.com/username )

    var url = require('url');
    var urlParts = url.parse(req.url, true, true);
    var pathname = urlParts.pathname;
    var username = pathname.slice(1);

Though for this to work, you have to create your route this way in your server.js file:

self.routes['/:username'] = require('./routes/users');

And set your route file this way:

router.get('/:username', function(req, res) {
 //here comes the url parsing code
}

Answer 15

Thank you all for this information. This is incredibly annoying.

Add this to your code and you'll never have to think about it again:

var app = express();

app.all("*", function (req, res, next) {  // runs on ALL requests
    req.fullUrl = req.protocol + '://' + req.get('host') + req.originalUrl
        next()
})

You can do or set other things there as well, such as log to console.

Answer 16

I actually discovered that by using this code below you can get your url. Then proceed to slicing it up and deciding what next.

app.use(function(req, res, next) {
console.log(req.originalUrl);
res.send(req.originalUrl);
  });

Answer 17

async function (request, response, next) {
  const url = request.rawHeaders[9] + request.originalUrl;
  //or
  const url = request.headers.host + request.originalUrl;
}

Answer 18

In 2021

The above answers are working fine but not preferred by the Documentation because url.parse is now legacy so I suggest you to use new URL() function if you want to get more control on url .

Express Way

You can get Full URL from the below code.

`${req.protocol}://${req.get('host')}${req.originalUrl}`

Example URL: http://localhost:5000/a/b/c?d=true&e=true#f=false

Fixed Properties ( you will get the same results in all routes )

req.protocol: http
req.hostname: localhost
req.get('Host'): localhost:5000
req.originalUrl: /a/b/c?d=true&e=true
req.query: { d: 'true', e: 'true' }

Not Fixed Properties ( will change in every route because it controlled by express itself )

Route: /

req.baseUrl: <blank>
req.url: /a/b/c?d=true&e=true
req.path: /a/b/c

Route /a

req.baseUrl: /a
req.url: /b/c?d=true&e=true
req.path: /b/c

Documentation: http://expressjs.com/en/api.html#req.baseUrl

URL Package Way

In the URL function, you will get the same results in every route so properties are always fixed .

Properties

const url = new URL(`${req.protocol}://${req.get('host')}${req.originalUrl}`);
console.log(url)

You will get the results like the below. I changed the order of the properties as per the image so it can match the image flow.

URL {
  href: 'http://localhost:5000/a/b/c?d=true&e=true',
  protocol: 'http:',
  username: '',
  password: '',
  hostname: 'localhost',
  port: '5000',
  host: 'localhost:5000',
  origin: 'http://localhost:5000',
  pathname: '/a/b/c',
  search: '?d=true&e=true',
  searchParams: URLSearchParams { 'd' => 'true', 'e' => 'true' },
  hash: ''
}

Note : Hash can not send to the server because it treats as Fragment in the server but you will get that in the client-side means browser.

Documentation: https://nodejs.org/api/url.html#url_new_url_input_base

Answer 19

通常我依靠这2个，取决于服务器和代理是否存在：

req.socket.remoteAddress

req.headers.referer

Answer 20

const fullUrl = `${protocol}://${host}:${port}${url}`
      
    const responseString = `Full URL is: ${fullUrl}`;                       
    res.send(responseString);  
})

Answer 21

You can combine req.protocol , req.hostname , and req.originalUrl . Note req.hostname rather than req.host or req.get("host") which works but is harder to read.

const completeUrl = `${req.protocol}://${req.hostname}${req.originalUrl}`;

Answer 22

Simply put it in .env where .env file is ignored by .gitignore so for each server environment you'll be having different .env with host string of that server in it

.env code

HOSTNAME=example.com

file where you want hotname.

const dotenv = require("dotenv");
dotenv.config();

console.log('hostname: '+process.env.HOSTNAME)

OUTPUT:

hostname: example.com

Answer 23

You can get the full url from req of express.

function fetchPages(req, res, next) {

    let fullUrl = req.headers.host + req.originalUrl;
    console.log("full url ==> ",fullUrl);
}