Browser & Web Performance · Junior · Question 41 of 75

What does a `304 Not Modified` response mean?

1The server refused the request
✓Correct answer: The cached copy is still valid and can be used; no body is sent
3The resource was deleted

Explanation

It's the answer to a conditional request (If-None-Match or If-Modified-Since). It saves bytes but still costs a round trip.

Further reading

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