Simple Reverse Proxy.js

// An extender script that adds a simple reverse proxy.

// To where the requests are sent.
var remoteAddress = "example.com";
var remotePort = 80;

// The address/port of the proxy.
var proxyAddress = "127.0.0.1";
var proxyPort = 8081;

var HttpSender = Java.type("org.parosproxy.paros.network.HttpSender");
var URI = Java.type("org.apache.commons.httpclient.URI");

var extensionNetwork = control
  .getExtensionLoader()
  .getExtension("ExtensionNetwork");
var proxy;

function messageHandler(ctx, msg) {
  if (!ctx.isFromClient()) {
    return;
  }

  var requestUri = msg.getRequestHeader().getURI();
  requestUri = new URI(
    requestUri.getScheme(),
    requestUri.getUserinfo(),
    remoteAddress,
    remotePort,
    requestUri.getPath()
  );
  msg.getRequestHeader().setURI(requestUri);
}

function install(helper) {
  proxy = extensionNetwork.createHttpProxy(
    HttpSender.PROXY_INITIATOR,
    messageHandler
  );
  proxy.start(proxyAddress, proxyPort);
}

function uninstall(helper) {
  proxy.stop();
}