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304 Not Modified (RFC 7232)

Indicates that the resource has not been modified since the version specified by the request headers If-Modified-Since or If-None-Match. In such case, there is no need to retransmit the resource since the client still has a previously-downloaded copy.

3xx redirection – further action needs to be taken in order to complete the request


By Ping Now, a website/API/service uptime monitor
Data from Wikipedia