---
title: 1.4.1.1 Security Configuration in PHP Proxy
description: "# Configure Security in PHP Proxy Included in the code distribution is **index.php** which can act as a simply proxy for use in a PHP-enabled Apache web server. This proxy file requires PHP to be compiled with XML support (default…"
url: "https://i2b2.org/docs/1-4-1-1-security-configuration-in-php-proxy/"
updated: "2026-09-15"
category: i2b2 Installation Guide / Chapter 5. Client Installation / 4. i2b2 Classic Web Client Install (optional) / 1.4 Configuration / 1.4.1 Proxy Configuration
---

# 1.4.1.1 Security Configuration in PHP Proxy

# Configure Security in PHP Proxy

Included in the code distribution is **index.php** which can act as a simply proxy for use in a PHP-enabled Apache web server. This proxy file requires PHP to be compiled with XML support (default setting in most Linux distributions). Within the PHP file are 2 arrays that are used to restrict all requests from connected web clients to only the IP addresses that the cells are located at.

| Array | Description |
| --- | --- |
| **$WHITELIST**   | List of ***acceptable*** URL prefixes.   |
| **$BLACKLIST** | List of**invalid** URL prefixes. |

***Examples:***

  **index.php**

# Steps to update the index.php file

WARNING

Make sure you are editing the files in your **web server directory** and not the ones that reside in *YOUR_I2B2_WC_DIR*.

1. Go to the **web client folder** in your **web server directory**.

***Linux Example:***   /var/www/html

***Windows Example:***   C:\inetpub\wwwroot

2. Open the **index.php** file to edit the existing arrays with information that is relevant to your security policies .

3. Save the changes and close the file.