Implementing browser caching is an important factor for improving website performance and optimizing pagespeed insights. Here are the steps to correctly implement browser caching:
- Set an appropriate expiration time: Set an appropriate expiration time for each resource, so the browser knows how long it should keep the resource in its cache. Generally, static resources like images, CSS, and JS files can be cached for a longer time, while dynamic resources like HTML and API responses should be cached for a shorter time.
- Use Cache-Control Headers: Set the Cache-Control header for each resource with an appropriate value to control how the cache should behave. The two most commonly used Cache-Control headers are max-age and public.max-age: Specifies the time in seconds that the resource should be cached. For example, Cache-Control: max-age=31536000 means the resource should be cached for a year.public: Indicates that the resource can be cached by both the client and intermediary servers like proxy servers.
- Use ETags: ETags are HTTP response headers that allow the browser to verify if a cached resource has been modified on the server. By using ETags, the browser can avoid downloading the resource again if it hasn't been modified.
- Enable gzip compression: Enable gzip compression to reduce the size of the resources being transferred. This can significantly improve page loading speed.
- Use a Content Delivery Network (CDN): A CDN can help improve the speed and reliability of delivering resources by caching them on servers located closer to the user.
- Test and Monitor: Test and monitor your website regularly to ensure that the caching settings are working as intended and adjust the settings as needed.
By correctly implementing browser caching, you can improve website performance and optimize pagespeed insights scores.