daap_server.php

<?php
$ampache_url = 'ampache.example.org:3689';  // EDIT ACCORDING TO YOUR NEEDS, DO NOT PUT ANY HTTP://

$request = $_SERVER['REQUEST_URI'];

$ch = curl_init();

// If there was a POST request, then forward that as well.
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $_POST);
}
curl_setopt($ch, CURLOPT_URL, 'http://'.$ampache_url . $request);
curl_setopt($ch, CURLOPT_HEADER, true);

$headers = getallheaders();
// Forward cookie as it came.
$headers['Host'] = $ampache_url;

$curlHeaders = array();
foreach ($headers as $k=>$v) {
    $curlHeaders[] = $k.': '.$v;
}
curl_setopt($ch, CURLOPT_HTTPHEADER, $curlHeaders);
if (isset($headers['Cookie'])) {
    curl_setopt($ch, CURLOPT_COOKIE, $headers['Cookie']);
}

curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

$response = curl_exec($ch);

$header_size = curl_getinfo($ch, CURLINFO_HEADER_SIZE);
$headers = substr($response, 0, $header_size);
$body = substr($response, $header_size);

$headerArray = explode(PHP_EOL, $headers);

// Process response headers.
foreach ($headerArray as $header) {
    $colonPos = strpos($header, ':');
    if ($colonPos !== false) {
        $headerName = substr($header, 0, $colonPos);

        // Ignore content headers, let the webserver decide how to deal with the content.
        if (trim($headerName) == 'Content-Encoding') {
            continue;
        }
        if (trim($headerName) == 'Content-Length') {
            continue;
        }
        if (trim($headerName) == 'Transfer-Encoding') {
            continue;
        }
    }
    header($header, false);
}

curl_close($ch);
echo $body;
return;

daap_server.sh

#!/bin/sh

php -S 0.0.0.0:3689 daap_server.php

vhost

<VirtualHost _default_:3690>
    DocumentRoot /var/local/ampache/daap/

    SetEnv nokeepalive

    <Directory "/var/local/ampache/daap/">
        Options Indexes FollowSymLinks MultiViews
        AllowOverride all
        Require all granted
    </Directory>
</VirtualHost>