<?php
header('Content-Type: text/plain; charset=utf-8');
header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');

$headers = [
    'CF-Connecting-IP'  => 'HTTP_CF_CONNECTING_IP',
    'CF-IPCountry'      => 'HTTP_CF_IPCOUNTRY',
    'CF-IPCity'         => 'HTTP_CF_IPCITY',
    'CF-Region'         => 'HTTP_CF_REGION',
    'CF-Region-Code'    => 'HTTP_CF_REGION_CODE',
    'CF-IPContinent'    => 'HTTP_CF_IPCONTINENT',
    'CF-IPLatitude'     => 'HTTP_CF_IPLATITUDE',
    'CF-IPLongitude'    => 'HTTP_CF_IPLONGITUDE',
    'CF-Timezone'       => 'HTTP_CF_TIMEZONE',
    'CF-Postal-Code'    => 'HTTP_CF_POSTAL_CODE',
    'CF-Ray'            => 'HTTP_CF_RAY',
    'CF-Visitor'        => 'HTTP_CF_VISITOR',
    'CF-Worker'         => 'HTTP_CF_WORKER',
    'CDN-Loop'          => 'HTTP_CDN_LOOP',
];

echo "Cloudflare request headers seen by origin\n";
echo str_repeat('=', 50) . "\n";
foreach ($headers as $label => $key) {
    $value = $_SERVER[$key] ?? '(not set)';
    printf("%-18s : %s\n", $label, $value);
}

echo "\n";
echo "Other geo-relevant context\n";
echo str_repeat('-', 50) . "\n";
printf("%-18s : %s\n", 'REMOTE_ADDR',      $_SERVER['REMOTE_ADDR']      ?? '(not set)');
printf("%-18s : %s\n", 'X-Forwarded-For',  $_SERVER['HTTP_X_FORWARDED_FOR'] ?? '(not set)');
printf("%-18s : %s\n", 'User-Agent',       $_SERVER['HTTP_USER_AGENT']  ?? '(not set)');
printf("%-18s : %s\n", 'Host',             $_SERVER['HTTP_HOST']        ?? '(not set)');

echo "\n";
echo "All raw HTTP_* headers (for spotting anything else)\n";
echo str_repeat('-', 50) . "\n";
foreach ($_SERVER as $k => $v) {
    if (strpos($k, 'HTTP_') === 0) {
        printf("%-32s : %s\n", $k, is_string($v) ? $v : json_encode($v));
    }
}