picture 1. http code 304 Not ModifiedThe HTTP status code 304 Not Modified is a no-content status code that indicates that the client sent a conditional request and the server found that the resource has not changed since the last request, so it returns this status code instead of retransmitting the same data. When a client (usually a browser) requests a resource from a server, if the resource has been cached before, it will include some information in the request header, such as If-Modified-Since or If-None-Match, to ask the server whether the resource has been modified.
If the server finds that the requested resource has not changed since the last request, it sends a 304 Not Modified response without including the actual content of the resource. This reduces bandwidth consumption and improves performance because the client can directly use its cached copy. 1.1. Example1.1.1. Client request header example: 1.1.2. Server response header example: In this example, the client provides an If-Modified-Since header indicating that it has a copy of the resource that has not been updated since the specified date. The server checks the resource and determines that it has not been modified since that date, so it returns a 304 Not Modified response. For front-end developers, understanding the 304 Not Modified response can help optimize application performance, especially when network requests are frequent. Proper use of HTTP caching mechanisms can significantly reduce data transmission and improve user experience. |
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