flash.moe/pages/blog.php

<?php
if(preg_match('#^/blog/([0-9]+)$#', $reqPath, $matches) || $reqPath === '/blog.php' || $reqPath === '/blog-post.php') {
    if($reqMethod !== 'GET')
        return FM_ERR | 405;
    header('Location: //flash.moe/2020/blog.php?blog=1&p=' . ($matches[1] ?? filter_input(INPUT_GET, 'p', FILTER_SANITIZE_NUMBER_INT) ?? ''));
    return FM_HIT | 302;
}

if($reqPath === '/blog-elements.json') {
    if($reqMethod !== 'GET')
        return FM_ERR | 405;

    header('Content-Type: application/json; charset=utf-8');

    $title = filter_input(INPUT_GET, 'title', FILTER_SANITIZE_STRING);

    ob_start();
    fm_component('header', [
        'title' => $title ?? '%title%',
        'external' => true,
        'styles' => [
            '//blog.flash.moe/assets/blog.css',
        ],
    ]);
    $header = ob_get_contents();
    ob_clean();
    fm_component('footer', [
        'external' => true,
        'scripts' => [
            '//blog.flash.moe/assets/blog.js',
        ],
    ]);
    $footer = ob_get_contents();
    ob_end_clean();

    echo json_encode([
        'header' => $header,
        'footer' => $footer,
    ]);

    return FM_HIT;
}