simple-http-proxy-server.js

var http = require('http'),
    net = require('net'),
    url = require('url'),
    util = require('util');

var server = http.createServer();
server.listen(8080);
server.on('request', function(request, response) {
    console.log(request);
    try {
        var parsedUrl = url.parse(request.url);
    } catch(e) {
        response.writeHead(400);
        response.end('URL Not Valid');
        return;
    }

    if (parsedUrl.hostname == 'webfiddler') {
        response.end('Hello, welcome to webfiddler');
    } else {
        var proxyRequest = http.request({
            host: parsedUrl.hostname,
            port: parsedUrl.port || 80,
            method: request.method,
            path: (parsedUrl.pathname || "/") + (parsedUrl.search || ""),
            headers: request.headers
        }, function(proxyResponse) {
            response.writeHead(proxyResponse.statusCode, proxyResponse.headers);
            util.pump(proxyResponse, response);
        });
        proxyRequest.on('error', function(e) {
            response.writeHead(504);
            response.end("504 Gateway Timeout");
        });
        util.pump(request,proxyRequest);
        request.on('close', function(err) {
            proxyRequest.abort();
        });
    }
});
server.on('checkContinue', function(request, response) {
    console.log('Expect: 100-continue recieved', request);
    response.writeHead(400);
    response.end("400 Bad Request");
});
server.on('upgrade', function(request, socket, head) {
    if (request.method == 'CONNECT') {
        try {
            var parsedUrl = (function(url) {
                var splitUrl = url.split(':');
                if (splitUrl.length != 2) throw Error();
                return {port: splitUrl[1], hostname: splitUrl[0]};
            })(request.url);
        } catch(e) {
            socket.write("HTTP/1.1 400 Bad Request\r\n\r\n");
            socket.end();
            return;
        }
        if (parsedUrl.port != 443) {
            socket.write("HTTP/1.1 400 Bad Request\r\n\r\n");
            socket.end();
            return;
        } 
        var proxySocket = net.createConnection(parsedUrl.port, parsedUrl.hostname);
        proxySocket.on('connect', function() {
            socket.write("HTTP/1.0 200 Connection established\r\n\r\n");
            util.pump(socket, proxySocket);
            util.pump(proxySocket, socket);
        });
    }
});