If-Modified-Since Header

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The HTTP If-Modified-Since request header makes a request conditional ; the server sends back the requested resource , with a 200 status , only if it has been modified after the date in the If-Modified-Since header; if the resource has not been modified since, the response is 304 without any body , and the Last-Modified response header of the previous request contains the date of the last modification1.

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References

  1. MDN. “If-Modified-Since header”. Available at: https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/If-Modified-Since . (Accessed: [2025-05-16 Fri 04:32]). ↩︎

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