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forwarded-for
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When you are hosting your applications behind a reverse load balancer the incoming requests will no longer have the IP address of your user but of the load balancer as it forwards the request to your node instance. Most load balancers allow you to modify the headers of the request and add original request information in it.
This module makes it easier to find the correct IP address of your connection by
detecting these headers that load balancers set and it will gracefully fall down
to the original req.address
that contained the IP address of the request
inside node.js. In addition to gracefully degrading to the original request we
also for other known locations of the address (which are usually set by
frameworks such as SockJS and Socket.IO etc.)
The module is released in the npm registry:
npm install --save forwarded-for
Let's start out with including the module in to your application:
'use strict';
var forwarded = require('forwarded-for');
The forwarded
variable will now contain the function which parses out the
request information for you in to a really simple object. This object contains
the following properties:
port
The remote port. It defaults to 0
.ip
The string representation of the remoteAddress. It defaults to '127.0.0.1'.When we fail to parse or detect an IP address we will use the default values to construct the object. To correctly parse the data the function requires the following arguments:
obj
The socket like object that probably contains the remoteAddressheaders
A reference to the HTTP headers of the requestwhitelist
, optional A white list of IP addresses of your load balancers so
people cannot make fake requests with x-forwarded-for
headers.So with all the information combined, it would look something like this:
'use strict';
var forwarded = require('forwarded-for');
require('http').createServer(function (req, res) {
var address = forwarded(req, req.headers);
res.end('Your ip address is '+ address.ip);
}).listen(8080);
MIT
FAQs
Abstraction for retrieving ip address information from a Node.js connection. Searches for proxy headers before degrading req.address
The npm package forwarded-for receives a total of 20,947 weekly downloads. As such, forwarded-for popularity was classified as popular.
We found that forwarded-for demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 6 open source maintainers collaborating on the project.
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