Foundation 304 refers to the HTTP status code that appears on the Internet. Its original meaning is "unmodified", that is, the server has not actually updated the resource and returned a new version. This status code is widely used on the Internet, especially in web crawlers and search engines. The server returns a 304 status code, which means that the browser does not need to reload resources, which helps save bandwidth resources and server overhead.

In web crawlers, if the policy allows the crawler to access a certain page multiple times, then the 304 status code can be used to optimize resource acquisition. If the loaded resources have not changed, the server will After returning 304, the browser can obtain it directly from the cache, which reduces the waste of bandwidth and server resources and reduces network latency.

The benefit of using the 304 status code is not only to save bandwidth resources and server overhead, but also to improve the performance of the web page. By reducing network traffic, page load times can be significantly shortened, website performance and user experience optimized, thereby increasing user retention and conversion rates. Therefore, website developers should pay more attention to the use of 304 status codes and use it to improve website quality.