// REFERENCE
304 Not Modified
Class: 3xx
The resource hasn't changed since last time (validated with ETag/If-Modified-Since). The browser uses its cached copy; it saves bandwidth and speeds up the site.
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Work with this in:
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301
301 Moved Permanently 302
302 Found (temporary redirect) 307
307 Temporary Redirect 308
308 Permanent Redirect
301 Moved Permanently 302
302 Found (temporary redirect) 307
307 Temporary Redirect 308
308 Permanent Redirect
Semantics per RFC 9110 and the IANA status code registry. Educational content.