I started off this quest with just a simple problem. To have the ability for users to address my nodebb forum (http://theamericanbulletin.com:8080) as (“http://forum.theamericanbulletin.com”). This simple problem turned into a quest through countless videos and reading ( at least fifty) mindnumbing posts on blogs and other forums. I am running a Windows server ( 2008 ) with IIS to service my Wordpress main site. My NodeBB forum is listening on port 8080. All advice was to work within the framework of Windows and IIS, using 'Rewrite', to route traffic on the Server. After days of frustration, I had to come up with a better plan. One that gets me above proprietary nuances. The only way to do that was to get hold of port 80 myself..my own proxy server.. and what better webserver than Nodejs. With little of a search I came accoss this project.
https://github.com/nodejitsu/node-http-proxy
I git cloned the above link.
Renamed the new directory to nodeproxy
e:\nodeproxy> npm install ( pulls all the needed modules)
created a new directory under the new 'nodeproxy' entitled MyProxy
Created the MyProxy.js file ( contents below )
Moved my WordPress to listen on port 8081 in IIS
Started new proxy server (e:\nodeproxy\myproxy> node myproxy.js )
Done!
Some notes about the js file. When I first started I used this post as a guideline. It used a routing table... exactly what I was looking for. Although I was not needing to spin-up three test servers, this provided some insight into the power if this little application. I could, if I wanted to.... spin-up as many listeners as I wanted..... listening on whatever, or as many port(s) as I wanted.
http://stackoverflow.com/questions/25896608/nodejs-routing-table-using-http-proxy
var httpProxy = require("http-proxy");
var url = require("url");
httpProxy.createServer(function(req, res, proxy) {
var hostname = req.headers.host.split(":")[0];
var pathname = url.parse(req.url).pathname;
// Options for the outgoing proxy request.
var options = { host: hostname };
// Routing logic
if(hostname == "127.0.0.1") {
options.port = 8083;
} else if(pathname == "/upload") {
options.port = 8082;
options.path = "/";
} else {
options.port = 8081;
}
// (add more conditional blocks here)
proxy.proxyRequest(req, res, options);
}).listen(8080);
console.log("Proxy listening on port 8080");
// We simulate the 3 target applications
var http = require("http");
http.createServer(function(req, res) {
res.end("Request received on 8081");
}).listen(8081);
http.createServer(function(req, res) {
res.end("Request received on 8082");
}).listen(8082);
http.createServer(function(req, res) {
res.end("Request received on 8083");
}).listen(8083);
I modified the above code to tailor it to my routes, but the server kept breaking. The proxy would throw a “socket hang up” when I moved between the Wordpress site and the NodeBB site. The error was not getting caught and the proxy would just break and go back to a system prompt. Another day of research lead me to this post.
http://www.clock.co.uk/blog/preventing-http-raise-hangup-error-on-destroyed-socket-write-from-crashing-your-nodejs-server
It was in this post where the idea of wrapping the proxy-server within a domain arose. Perfect! I can pass the error up to the domain and let it dispose of it while the proxy keeps serving ( at least that's how I think it works). Plus the added benefit of having and overlord (parent) to all the potential listeners that could be spun-up to report to. But that is a whole different subject.
So I added a Domain to the mix and came-up with a working solution. While this only apples to those with 'full' control over their servers, it does add a layer of control over proprietary systems running on your machine, and frees the developer (to a point) from those systems. I do not have to mess with rewrite... or some Apache routine tables. This is 'clean' and simple.
Please feel free to improve on this concept and tighten this up. There is room for lots of improvement here. Please add to the knowledge.
Rich
MyProxy.Js
var util = require('util'),
http = require('http'),
url = require('url'),
domain = require('domain')
httpProxy = require('../lib/http-proxy'),
proxy = httpProxy.createProxyServer({});
serverDomain = domain.create();
proxy.on('error', function(err, req, res)
{
console.log(err.message);
});
serverDomain.run(function () {http.createServer(function(req, res)
{
var reqd = domain.create()
reqd.add(req)
reqd.add(res)
// On error dispose of the domain
reqd.on('error', function (error) {
console.error('Error', error, req.url)
reqd.dispose()
});
var oUrl = url.parse(req.url);
if (typeof req.headers !== 'undefined' && req.headers.host.split)
{
var hostname = req.headers.host.split(":")[0];
var pathname = oUrl.pathname;
switch(hostname)
{
case 'forum.theamericanbulletin.com':
proxy.web(req, res, { target: 'http://localhost:8080' });
break;
default:
proxy.web(req, res, { target: 'http://localhost:8081' });
};
console.log(hostname);
console.log(pathname);
}
}).listen(80,function(){
console.log('proxy listening on port 80');
});
});
