能否用%{HTTP_HOST}与RewriteCond拦截网站？特定时段拦截配置求助

Hey there! Let's work through your time-based site blocking issue with Apache's mod_rewrite, and also cover some alternative methods that might be a better fit for your needs.

First, let's fix your existing setup. There are a few small tweaks needed to make it reliable:

1. Server Timezone Check: The %{TIME_HOUR} variable uses your server's system timezone, not your local time. Double-check that the 11-15 hour range aligns with when you want the block to activate on the server's clock.
2. Escaped Domain Dots: In regex, dots match any character—so we need to escape them in www.facebook.com to ensure we're targeting the exact domain.
3. Cleaner Hour Range: Instead of listing each hour individually, we can use range conditions for better maintainability.
4. Explicit Redirect Type: Adding R=302 tells browsers it's a temporary redirect (use R=403 if you prefer returning a "Forbidden" error instead of sending users to a custom page).

Here's the revised working configuration:

<IfModule rewrite_module>
    RewriteEngine On
    # Block www.facebook.com between 11:00 and 15:59 server time
    RewriteCond %{HTTP_HOST} ^www\.facebook\.com$ [NC]
    RewriteCond %{TIME_HOUR} >=11
    RewriteCond %{TIME_HOUR} <=15
    RewriteRule ^(.*)$ /restriction_social.html [L,R=302]
</IfModule>

If mod_rewrite feels overly complex, these approaches might suit you better:

1. Apache 2.4+ mod_authz_core (More Readable) #

This module lets you define access controls with straightforward time-based logic, no rewrite rules required:

<If "%{HTTP_HOST} == 'www.facebook.com' && %{TIME_HOUR} >= 11 && %{TIME_HOUR} <= 15">
    # Redirect to your custom restriction page
    Redirect 302 / /restriction_social.html
    
    # OR, if you want to block access entirely with a 403 error:
    # Require all denied
</If>

2. Server-Side Script for Advanced Logic #

If you need flexibility (like different rules for weekdays vs weekends), a simple server-side script can handle dynamic checks. For example, with PHP:

First, update your Apache config to route requests to the script:

<IfModule rewrite_module>
    RewriteEngine On
    RewriteCond %{HTTP_HOST} ^www\.facebook\.com$ [NC]
    RewriteRule ^(.*)$ /time_block_check.php [L]
</IfModule>

Then create time_block_check.php in your document root:

<?php
$currentHour = (int)date('H');
$currentHost = $_SERVER['HTTP_HOST'];

// Check if we're in the blocked window for the target domain
if ($currentHost === 'www.facebook.com' && $currentHour >= 11 && $currentHour <= 15) {
    header('Location: /restriction_social.html');
    exit;
} else {
    // Allow normal access to the site
    header("Location: https://$currentHost{$_SERVER['REQUEST_URI']}");
    exit;
}
?>

内容的提问来源于stack exchange，提问作者Eduardo Hernández