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I'm new in Node.JS and deployed the first application on VPS. After running on port 8000 , i decided create a http-proxy for forward each domain to its specific port . I worte a little application like here :

var http = require('http'),
    httpProxy = require('http-proxy');
var option = {
    router : {
        'domain.com' : 'http://88.198.86.100:8000'
var proxyServer = httpProxy.createServer(option);
proxyServer.listen(80);
88.198.86.100 is my server ip.
So, my problem here is shown , when i typed 88.198.86.100 in my browser PC (Google Chrome), my proxy application in server was carshed and gave this error : 
C:\Users\Administrator\Desktop\Nodejs\node_modules\http-proxy\lib\http-proxy\index.js:119
throw err;
Error: Must provide a proper URL as target
at ProxyServer.<anonymous> (C:\Users\Administrator\Desktop\Nodejs\node_modules\http-proxy\lib\http-proxy\index.js:68:35)
at Server.closure (C:\Users\Administrator\Desktop\Nodejs\node_modules\http-proxy\lib\http-proxy\index.js:125:43)
at emitTwo (events.js:106:13)
at Server.emit (events.js:191:7)
at HTTPParser.parserOnIncoming [as onIncoming] (_http_server.js:546:12)
at HTTPParser.parserOnHeadersComplete (_http_common.js:99:23)
error: Forever detected script exited with code: 1
I want to someone enter IP server into the each browser, my application will not crash.
    require('http').createServer(function(req, res) {
    proxy.web(req, res, {
          target: options[req.headers.host]
    }).listen(80);
        
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