CDN (Content Delivery Network) supports various cache expiration configurations to optimize content delivery and ensure freshness of data. These configurations typically include:
Time-To-Live (TTL): This is the most common method, where you specify the duration (in seconds) for which a file should be cached. For example, setting a TTL of 3600 seconds means the content will be cached for one hour before it's refreshed.
Explicit Expiry: Some CDNs allow you to set an exact date and time for content to expire, which can be useful for time-sensitive materials like promotional offers or event schedules.
Custom Headers: You can use HTTP headers like Cache-Control and Expires to manage caching behavior. For instance, Cache-Control: max-age=3600 directs the CDN to cache the content for one hour.
Versioning: By appending version numbers or timestamps to file names, you can ensure that updated content is fetched instead of serving cached versions. This isn't a direct expiration setting but a strategy to control cache invalidation.
Dynamic Content Caching: For dynamic content, some CDNs offer settings to cache based on parameters like query strings, which can help in caching different versions of a page for different users.
For example, if you're hosting a website on Tencent Cloud, you can leverage its CDN service to set cache expiration policies through the console or API. You can specify the TTL for different types of content, use custom headers for more granular control, and even implement versioning strategies to manage updates effectively.
Tencent Cloud's CDN provides flexible configurations to meet these needs, ensuring efficient content delivery and reduced latency for your users.