What is a 304 mean?

A 304 status code in HTTP is referred to as "Not Modified." This status code indicates that the requested resource has not been modified since the last time it was accessed, and therefore there is no need to resend the entire response. Instead, the client can use the cached version of the resource.

The 304 status code is often used in scenarios where the client has made a conditional GET request, specifying certain conditions that must be met for the server to send back the resource. If the conditions are not met, the server will respond with a 304 status code.

Overall, the 304 status code helps to improve performance and reduce unnecessary data transfer by allowing clients to use cached resources when they have not been modified.