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This module is a fork of original proxywrap by Josh Dague. Unfortunately, the project doesn't have recent changes. As so, we decided to contribute to it by forking it and make it better.

What's the purpose of this module?

This module wraps node's various Server interfaces so that they are compatible with the PROXY protocol. It automatically parses the PROXY headers and resets socket.remoteAddress and socket.remotePort so that they have the correct values.

This module is especially useful if you need to get the client IP address when you're behind an AWS ELB in TCP mode.

In HTTP or HTTPS mode (aka SSL termination at ELB), the ELB inserts X-Forwarded-For headers for you. However, in TCP mode, the ELB can't understand the underlying protocol, so you lose the client's IP address. With the PROXY protocol and this module, you're able to retain the client IP address with any protocol.

In order for this module to work with ELB, you must enable the PROXY protocol on your ELB (or whatever proxy your app is behind).

Compability

This module is only compatible with LTS and latest stable versions of node.

Installing

npm install --save findhit-proxywrap

Usage

proxywrap is a drop-in replacement. Here's a simple Express app:

var http = require( 'http' )
var proxiedHttp = require( 'findhit-proxywrap' ).proxy( http )
var express = require( 'express' )
var app = express()

// instead of http.createServer(app)
var srv = proxiedHttp.createServer( app ).listen( 80 )

app.get( '/', ( req, res ) => {
    res.send( 'IP = ' + req.connection.remoteAddress + ':' + req.connection.remotePort )
})

The magic happens in the proxywrap.proxy() call. It wraps the module's Server constructor and handles a bunch of messy details for you.

You can do the same with net (raw TCP streams), https, and spdy. It will probably work with other modules that follow the same pattern, but none have been tested.

Note: If you're wrapping node-spdy, its exports are a little strange:

var proxiedSpdy = require('proxywrap').proxy(require('spdy').server);

This also adds to all your sockets the properties:

Warning: By default, all traffic to your proxied server MUST use the PROXY protocol. If the first five bytes received aren't PROXY, the connection will be dropped. Obviously, the node server accepting PROXY connections should not be exposed directly to the internet; only the proxy (whether ELB, HAProxy, or something else) should be able to connect to node.

API

proxy(Server[, options])

Wraps something that inherits from the net module, exposing a Server and createServer. Returns the same module patched to support the PROXY protocol.

Options:

Contribute

Do you have any idea to improve this module? Feel free to open an Issue or a Pull Request.

People who have contributed so far

Thanks

Thanks to all contibuters and special thanks to Josh Dague for creating original proxywrap.