Wordfence Falcon Homepage Workaround

gistfile1.php

<?php

// Wordfence Cache Workaround
// Apache 2.4.? - 2.4.8 contains a bug between mod_dir and mod_rewrite that prevents Wordfence's Falcon
// caching from working on the homepage, but just the homepage. This is a workaround for that issue.
$targetDomain = 'www.yourdomain.com';

// We'll need to check cookie existence to determine if the visitor is logged in. Some WP cookie names
// include a unique hash at the end, so we'll need to check by collecting all the cookie names, and
// passing them through a regex.
$cookieNames = preg_quote(implode(' ', array_keys($_COOKIE)), '/');
$cookieNameRegex = '/(comment_author|wp-postpass|wpmp_switcher|wordpress_logged_in_[^ ]+)/';

if (

    // Only show cache with HTTP GET
    strtolower($_SERVER['REQUEST_METHOD']) === 'get' &&

    // Check to make sure UA is requesting the target domain
    !empty($_SERVER['HTTP_HOST']) &&
    strtolower($_SERVER['HTTP_HOST']) === strtolower($targetDomain) &&

    // Is this a homepage request?
    $_SERVER['REQUEST_URI'] === '/' &&

    // Not checking wf_logout cookie at this time. Always seems to be '1' if you've logged in before.
    // (isset($_COOKIE['wf_logout']) && $_COOKIE['wf_logout'] === '1')

    // Check for WP-generated cookie existence
    !preg_match($cookieNameRegex, $cookieNames)
)
{
    // Detect if we should use gzip version
    $gzip = (isset($_SERVER['HTTP_ACCEPT_ENCODING']) && strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip') !== false);

    // Detect if a cache file exists. Serve up gzip version if the UA supports gzip.
    $file = __DIR__."/wp-content/wfcache/".$targetDomain."_/~~~~_wfcache.html" . ($gzip ? '_gzip' : '');

    if (file_exists($file))
    {
        $cache = file_get_contents($file);

        if ($gzip)
        {
            // Need to supply these headers for gzip to work as expected
            header('Content-Encoding: gzip');
            header('Content-Length: '.strlen($cache));
        }

        echo $cache;
        exit;
    }
}

unset($targetDomain, $cookieNames, $cookieNameRegex);

/**
 * Front to the WordPress application. This file doesn't do anything, but loads
 * wp-blog-header.php which does and tells WordPress to load the theme.
 *
 * @package WordPress
 */

/**
 * Tells WordPress to load the WordPress theme and output it.
 *
 * @var bool
 */
define('WP_USE_THEMES', true);

/** Loads the WordPress Environment and Template */
require( dirname( __FILE__ ) . '/wp-blog-header.php' );