WordPress pages not updating in time after using CDN? Caching Mechanism Explained

Many WordPress users have encountered this problem after accessing CDN acceleration for their websites: the background updates posts, modifies page content or CSS styles, but the frontend remains unchanged for a long time, and visitors still see the old content. This is actually related to the CDN caching mechanism. In this article, we will analyze the CDN With WordPress caching principles, and provide solutions to help you ensure that the accelerated effect at the same time, the update instantly effective.

1. Why using a CDN causes delays in page updates

CDNs (Content Delivery Networks) are used to deliver web resources to the public through the transfer of(computing) cacheto global nodes to achieve proximity access and speed up page loading. However, the essence of caching is to keep the content in the node server for a period of time, reducing the number of back-to-source requests.

Typical Cache Flow

• The user accesses the page and the CDN checks if the node is cached or not
• Cached → returns the cached content directly
  No cache → source back toserver (computer)Get, return to the user, and cache that content to the node

This means that if you update your content in the WordPress backend before the cache expires, even if you update the content, visitors will still be accessing the cached version, with a delayed update.

2. Types of CDN caches

2.1 Static Cache

• Acts on pictures,CSS, JS, font files
• These files are updated infrequently and setting a longer cache (30 days or more) has no effect.

2.2 Dynamic caching (page caching)

• act HTML Pages, e.g. home page, article pages, category pages

• If the CDN caches the HTML, the cached version will not be invalidated immediately after the article is updated in the backend.

3. WordPress page update delay common causes

• CDN caching rules set page caching and TTL (cache expiration time) is too long
• The Purge/Invalidate feature is not configured.
• Conflicts with CDN configurations using caching plugins (e.g. LiteSpeed Cache, WP Rocket)
• Cache update back to source validation is not enabled

4. Solution and configuration recommendations

4.1 Configuring Cache Refresh in the CDN Backend

Cloudflare Example:

• Login Cloudflare Dashboard
• Select Site → Caching → Configuration
• Configure Always Online with Development Mode (when Development Mode is on, the cache is paused for debugging)

• After modifying the content, you can select it in Caching → Purge Cache:
  • Purge Everything (empties all caches, updates immediately, but increases pressure to return to source)
  • Custom Purge (press URL (Empty the cache and update it accurately)

4.2 CDN Auto-Refresh with Cache Plugin

Some caching plugins (LiteSpeed Cache, WP Rocket,W3 Total Cache) can be integrated with the CDN API to automatically refresh the cache when content is updated.

Take LiteSpeed Cache for example:

• LiteSpeed Cache → CDN → Cloudflare → Fill in API Key and Email

• After updating a post, the plugin calls the Cloudflare API to flush the corresponding page cache

4.3 Setting a Reasonable Cache TTL

It is not recommended to set a long cache time for HTML pages if the site is updated frequently.

• Static files (photograph(CSS, JS): Cached for more than 30 days.
• Dynamic pages (HTML): cached 5 minutes - 1 hour, adjusted for frequency of updates

4.4 Combining Cache Control Response Headers

Setting the Cache-Control header in a server or caching plugin. example:

Cache-Control: no-cache, must-revalidate

Or use a short TTL + must-revalidate for dynamic pages, requiring the CDN node to re-validate back to the source after the cache expires.

5. Summary

WordPress pages are not as easy to use as they should be when using CDN The core reason for the untimely update is the dynamic HTML cache configuration. Through the reasonable setting of cache refresh, the use of caching plug-ins to automatically integrate CDN APIs, and configure the appropriate TTL, you can take into account the acceleration and real-time updating, so as to prevent visitors from seeing old content.

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