node-http-proxy

#!/usr/bin/env node

var path = require('path'),
    fs = require('fs'),
    util  = require('util'),
    argv = require('optimist').argv,
    httpProxy = require('./../lib/node-http-proxy');

var help = [
    "usage: node-http-proxy [options] ",
    "",
    "All options should be set with the syntax --option=value",
    "",
    "options:",
    "  --port   PORT       Port that the proxy server should run on",
    "  --target HOST:PORT  Location of the server the proxy will target",
    "  --config OUTFILE    Location of the configuration file for the proxy server",
    "  --silent            Silence the log output from the proxy server",
    "  -h, --help          You're staring at it"
];

if (argv.h || argv.help || Object.keys(argv).length === 2) {
  util.puts(help.join('\n'));
  process.exit(0);
}

var location, config = {},
    port = argv.port || 80, 
    target = argv.target;

//
// If we were passed a config, parse it
//
if (argv.config) {
  try {
    var data = fs.readFileSync(argv.config);
    config = JSON.parse(data.toString());
  } catch (ex) {
    util.puts('Error starting node-http-proxy: ' + ex);
    process.exit(1);
  }
}

//
// Check to see if we should silence the logs
//
config.silent = typeof argv.silent !== 'undefined' ? argv.silent : config.silent;

//
// If we were passed a target, parse the url string
//
if (target) location = target.split(':');

//
// Create the server with the specified options
//
var server;
if (location) {
  var targetPort = location.length === 1 ? 80 : location[1];
  server = httpProxy.createServer(targetPort, location[0], config);
}
else {
  server = httpProxy.createServer(config);
}

//
// Start the server
//
server.listen(port);

//
// Notify that the server is started
//
if (!config.silent) {
  util.puts('node-http-proxy server now listening on port: ' + port);
}