An HTTP proxy written with Node.js (think Squid). 

An HTTP proxy written with Node.js (think Squid)

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var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {

    var desc = Object.getOwnPropertyDescriptor(m, k);

    if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {

      desc = { enumerable: true, get: function() { return m[k]; } };

var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {

    Object.defineProperty(o, "default", { enumerable: true, value: v });

var __importStar = (this && this.__importStar) || function (mod) {

    if (mod && mod.__esModule) return mod;

    if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);

var __importDefault = (this && this.__importDefault) || function (mod) {

    return (mod && mod.__esModule) ? mod : { "default": mod };

Object.defineProperty(exports, "__esModule", { value: true });

const assert_1 = __importDefault(require("assert"));

const net = __importStar(require("net"));

const url = __importStar(require("url"));

const http = __importStar(require("http"));

const pkg_1 = __importDefault(require("./pkg"));

const debug_1 = __importDefault(require("debug"));

    request: (0, debug_1.default)('proxy ← ← ←'),

    response: (0, debug_1.default)('proxy → → →'),

    proxyRequest: (0, debug_1.default)('proxy ↑ ↑ ↑'),

    proxyResponse: (0, debug_1.default)('proxy ↓ ↓ ↓'),

 * Sets up an `http.Server` or `https.Server` instance with the necessary

 * "request" and "connect" event listeners in order to make the server act

 * 13.5.1 End-to-end and Hop-by-hop Headers

 * Hop-by-hop headers must be removed by the proxy before passing it on to the

 * next endpoint. Per-request basis hop-by-hop headers MUST be listed in a

 * Connection header, (section 14.10) to be introduced into HTTP/1.1 (or later).

// create a case-insensitive RegExp to match "hop by hop" headers

const isHopByHop = new RegExp('^(' + hopByHopHeaders.join('|') + ')$', 'i');

 * Iterator function for the request/response's "headers".

    // every even entry is a "key", every odd entry is a "value"

 * HTTP GET/POST/DELETE/PUT, etc. proxy requests.

    debug.request('%s %s HTTP/%s ', req.method, req.url, req.httpVersion);

    // pause the socket during authentication so no data is lost

            value += ', ' + socket.remoteAddress;

            debug.proxyRequest('appending to existing "%s" header: "%s"', key, value);

            if (typeof socket.remoteAddress === 'string') {

                value += ', ' + socket.remoteAddress;

                debug.proxyRequest('appending to existing "%s" header: "%s"', key, value);

        if (!hasVia && 'via' === keyLower) {

            // append to existing "Via" header

            debug.proxyRequest('ignoring hop-by-hop header "%s"', key);

                headers[key] = [v, value];

    // add "X-Forwarded-For" header if it's still not here by now

    // http://en.wikipedia.org/wiki/X-Forwarded-For

    if (!hasXForwardedFor && typeof socket.remoteAddress === 'string') {

        headers['X-Forwarded-For'] = socket.remoteAddress;

        debug.proxyRequest('adding new "X-Forwarded-For" header: "%s"', headers['X-Forwarded-For']);

    // add "Via" header if still not set by now

        debug.proxyRequest('adding new "Via" header: "%s"', headers.Via);

    // custom `http.Agent` support, set `server.agent`

    //		'setting custom `http.Agent` option for proxy request: %s',

    //	// default the port number if not specified, for >= node v0.11.6...

    //	// https://github.com/joyent/node/issues/6199

        // only "http://" is supported, "https://" should use CONNECT method

        res.end(`Only "http:" protocol prefix is supported (got: "${parsed.protocol}")\n`);

    debug.proxyRequest('%s %s HTTP/1.1 ', proxyReq.method, proxyReq.path);

    proxyReq.on('response', function (proxyRes) {

        debug.proxyResponse('HTTP/1.1 %s', proxyRes.statusCode);

        for (const [key, value] of eachHeader(proxyRes)) {

            debug.proxyResponse('Proxy Response Header: "%s: %s"', key, value);

                debug.response('ignoring hop-by-hop header "%s"', key);

                    headers[key] = [v, value];

                    headers[key] = value;

        debug.response('HTTP/1.1 %s', proxyRes.statusCode);

        res.writeHead(proxyRes.statusCode || 200, headers);

    proxyReq.on('error', function (err) {

        debug.proxyResponse('proxy HTTP request "error" event\n%s', err.stack || err);

            debug.response('already sent a response, just destroying the socket...');

        else if ('ENOTFOUND' == err.code) {

            debug.response('HTTP/1.1 404 Not Found');

            debug.response('HTTP/1.1 500 Internal Server Error');

    // if the client closes the connection prematurely,

        debug.request('client socket "close" event, aborting HTTP request to "%s"', req.url);

        debug.response('"finish" event');

        socket.removeListener('close', onclose);

        res.removeListener('finish', onfinish);

async function onconnect(req, socket, head) {

    (0, assert_1.default)(!head || 0 == head.length, '"head" should be empty for proxy requests');

    // define request socket event listeners

    socket.on('close', function onclientclose() {

        debug.request('HTTP request %s socket "close" event', req.url);

    socket.on('end', function onclientend() {

        debug.request('HTTP request %s socket "end" event', req.url);

    socket.on('error', function onclienterror(err) {

        debug.request('HTTP request %s socket "error" event:\n%s', req.url, err.stack || err);

    // define target socket event listeners

        debug.proxyResponse('proxy target %s "close" event', req.url);

        debug.proxyResponse('proxy target %s "end" event', req.url);

        debug.proxyResponse('proxy target %s "error" event:\n%s', req.url, err.stack || err);

        else if (err.code === 'ENOTFOUND') {

  "description": "An HTTP proxy written with Node.js (think Squid)",

  "author": "Nathan Rajlich <nathan@tootallnate.net> (http://n8.io/)",

		{
		"name": "proxy",
		"version": "2.1.0",
		"version": "2.1.1",
		"description": "An HTTP proxy written with Node.js (think Squid)",
		@@ -5,0 +5,0 @@ "main": "./dist/proxy.js",

		@@ -130,4 +130,6 @@ "use strict";
		hasXForwardedFor = true;
		value += ', ' + socket.remoteAddress;
		debug.proxyRequest('appending to existing "%s" header: "%s"', key, value);
		if (typeof socket.remoteAddress === 'string') {
		value += ', ' + socket.remoteAddress;
		debug.proxyRequest('appending to existing "%s" header: "%s"', key, value);
		}
		}
		@@ -158,3 +160,3 @@ if (!hasVia && 'via' === keyLower) {
		// http://en.wikipedia.org/wiki/X-Forwarded-For
		if (!hasXForwardedFor) {
		if (!hasXForwardedFor && typeof socket.remoteAddress === 'string') {
		headers['X-Forwarded-For'] = socket.remoteAddress;
		@@ -194,3 +196,3 @@ debug.proxyRequest('adding new "X-Forwarded-For" header: "%s"', headers['X-Forwarded-For']);
		headers,
		localAddress: this.localAddress
		localAddress: this.localAddress,
		});
		@@ -197,0 +199,0 @@ debug.proxyRequest('%s %s HTTP/1.1 ', proxyReq.method, proxyReq.path);

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