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What is HTTP 304 Not Modified?

The HTTP 304 Not Modified status code indicates the resource you are trying to access has not been modified since your last request. The server will not resend the resource to you and expects your browser to show you the one from its cache.

The 304 Not Modified status code prevents unnecessary data transfer as the client already has the resource in its cache. That way, it reduces bandwidth usage and increases the speed at which you access a resource. 

The 304 Not Modified redirect belongs to the 3xx series of HTTP status codes.

  • 3 indicates the status code is a redirection.
  • xx is a placeholder for two numbers, which provide more specific information about the status of the HTTP request.
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