The front-end image of AnQi CMS has not been updated: An in-depth analysis of cache difficulties and efficient troubleshooting guide

As a senior website operator, I know the feeling of restlessness and impatience when the content of the website is updated in the background, but the front end remains unchanged.Especially on the high-frequency operation of image updates, this phenomenon is even more common.AnQiCMS (AnQiCMS) is a content management system developed based on the Go language, known for its efficiency and stability. Its excellent performance is often inseparable from the exquisite cache mechanism.However, it is these efficiency-boosting caches that sometimes become the 'behind-the-scenes black hand' that prevents image updates from being reflected in the foreground in a timely manner.

This article will analyze the potential causes of unupdated images on the front page of Anqi CMS from multiple cache levels and provide a systematic troubleshooting method to help you solve this problem efficiently.

Browser cache: The most common 'trick'},

Most of the time, the images are not updated not because of the server-side issues, but because of your browser being mischievous.The browser stores visited static resources (including images, CSS, JS, etc.) locally to speed up page loading.When you visit the same page again, if these resources have not changed, the browser will directly read from the local cache without re-requesting from the server.

During the operation of AnQi CMS, when you update the picture in the background, if the browser still uses the old cached version, the old picture will naturally be displayed on the front end.This is a very common phenomenon, especially when you, as a website administrator, immediately check after frequent content updates.According to the Anqi CMS documentation, 'After the image is uploaded, if the background is updated but the front-end is not, please clear the local browser cache.'

The method to troubleshoot and solve this problem is relatively simple:

  • Force page refresh:通常是 on Windows systems:Ctrl + F5It is on macOSCmd + Shift + RThis will tell the browser to ignore the local cache and reload all resources from the server
  • Clear the browser cache:If the forced refresh does not work, you can go to the browser settings and clear all browsing data, especially the 'cached images and files'.Clear and close the browser, then visit the website.

Anqi CMS system cache: performance optimization at the application level

AnQi CMS as a high-performance content management system, built-in static cache and other optimization measures, aimed at improving website loading speed and SEO performance.This means that even if the image file has been updated on the server, the Anqicms itself may still hold a cached version of the old image, causing it to still refer to the old resources when generating the front-end page.

The 'Content Settings' feature of AnQi CMS provides options such as 'Enable Webp image format', 'Automatically compress large images', 'Thumbnail processing method', and other image processing options.When these settings change, or a new image is generated by the system, if the application layer cache of Anqi CMS is not updated in time, the image path or display effect on the front page may still be in the old state.

You need to solve the cache problem at the system level of AnQi CMS:

  • Perform the "Update Cache" operation:In the background management interface of AnQi CMS, there is usually a clear 'Update Cache' or 'Clear Cache' button (as specified in the document, located in the 'Cache Update' function module).Click this button, AnQi CMS will clear the old cached data stored internally, force the system to regenerate the page content, including image references.
  • Check the image processing settings:If you have recently modified the WebP conversion, image compression, or thumbnail generation rules, please make sure to also perform the cache cleaning of the Anqi CMS after updating the images to ensure that these new rules can be applied to the newly generated images.

Web server cache: Potential obstacle of reverse proxy layer

In many secure CMS deployment scenarios, to improve performance, security, or to implement multi-site management, Nginx, Apache, and other web servers are used as reverse proxies.These web servers also have powerful caching capabilities, they can cache the content generated by the backend applications (i.e. secure CMS), directly respond to user requests, thereby reducing the backend pressure.

After the AnQi CMS updates the image and clears its own cache, if the upper-level Nginx or Apache server still provides the old cached content, then the front-end users will still see the unupdated image. Especially when the configuration file enables such asproxy_cacheWhen the command is waiting, this level of cache needs special attention.

The troubleshooting and resolution steps for web server cache usually include:

  • Check the Web server configuration:Log in to your server, check the Nginx or Apache configuration file (for examplenginx.confor the virtual host configuration), look for anyproxy_cache/fastcgi_cacheor other caching-related commands.
  • Manually clean the web server cache:If it is confirmed that there is a web server cache, you need to manually clean the corresponding cache directory. For example, for Nginx, it is usually necessary to deleteproxy_cache_pathThe specified cache file or directory. After cleaning, be sure to restart the Nginx or Apache service to make the new configuration take effect, or force refresh the cache.

CDN Cache: The 'time lag' effect of a global distribution network

For websites that are aimed at global users or have high traffic, content delivery networks (CDN) are common acceleration solutions.CDN distributes website content to edge nodes around the world, allowing users to access content from the nearest node, significantly improving access speed.However, CDN will also cache static resources (including images).

If your website uses a CDN, even after you have cleared the cache of your browser, the Anqiz CMS backend system, and the web server, the CDN edge node may still store the old version of the image after the Anqiz CMS backend image is updated.This may cause the content seen by users in different geographical locations to be inconsistent, or the front-end image may still display the old version for a period of time after the update.

What you need to solve the CDN cache problem:

  • Log in to the CDN service provider's console:Visit the management interface of the CDN service provider you are using (such as Cloudflare, Alibaba Cloud CDN, Tencent Cloud CDN, etc.).
  • Perform the 'refresh cache' or 'preheat' operation:In the CDN control panel, find the corresponding domain or URL, and select the "Purge Cache" feature.You can choose to refresh all content or specify refreshing a few specific image URLs.Some CDN services also provide "pre-warming" functionality, which can actively push new content to edge nodes.

Consideration of troubleshooting order and non-cache factors

To efficiently resolve the issue of unupdated images, it is recommended that you check in the following order:

  1. Browser Caching:Check first, usually the simplest reason.
  2. AnQi CMS system cache:Clear background cache to ensure that the latest content is generated at the application layer.
  3. Web server cache:If there is an Nginx/Apache reverse proxy, check and clear its cache.
  4. CDN cache:If a CDN is used, be sure to refresh the CDN node cache.

If all the above caches have been checked and cleared, but the image still does not update, then the problem may have gone beyond the scope of the cache, and you need to consider the following non-cache factors:

  • Image path error:Check if the image URL referenced on the front-end page is correct, whether it points to the newly uploaded image.
  • Image file itself has a problem:Is the newly uploaded image file corrupted, incorrectly formatted, or too large to cause a loading failure.
  • File system permissions:Is the directory permission for storing image files on the server correct, does AnQiCMS have permission to read and provide these files.
  • Template code error:Is there a logical error in the code that references images in the front-end template, causing the new image to be unable to be correctly retrieved.

By systematically checking and eliminating these potential issues, you will be able to locate and resolve the problem of the unupdated images on the front page of the Anqi CMS more quickly and accurately, ensuring the timeliness of website content and the smoothness of user experience.

Frequently Asked Questions (FAQ)

Q1: I just uploaded a new image to replace the old one on the AnQi CMS backend, why do I still see the old image when I immediately visit the front page?

This is usually caused by your browser caching old images.The browser speeds up loading by storing the static resources (including images) you have visited locally.After you update the image in the background, the browser may still read the old image from the local cache.You can try to force refresh the page (Windows: Ctrl+F5;macOS: Cmd+Shift+R) or completely clear the browser cache to resolve.

Q2: I have cleared the browser cache and clicked the 'Update Cache' button on the Anqi CMS backend, but the front-end images are still old. What could be the problem?

If the browser and the security CMS system cache have been cleared but the problem still persists, it is likely that your web server (such as Nginx, Apache) as a reverse proxy has also configured caching.These web servers will cache the content generated by the backend application.You need to log in to the server, check the Nginx/Apache configuration files, manually clean the corresponding cache directories, and then restart the Web service.

Q3: My website uses CDN services, and after the update of the Anqi CMS images, they are new on my computer, but some users still report that they are old. What's the matter?

This is usually caused by CDN caching. CDN distributes your website's static resources to edge nodes around the world for caching.After you update the image, the CDN edge node may still retain the old version of the image.You need to log in to the CDN service provider's console, find the corresponding domain or URL, and execute "refresh cache" (Purge Cache