Browser & Web Performance · Middle · Question 50 of 75

What does `Access-Control-Max-Age` do?

1Sets the cookie lifetime for cross-origin requests
2Limits how long the actual response can be cached
✓Correct answer: Lets the browser cache the preflight result for a period, avoiding a new OPTIONS request each time

Explanation

Browsers cap the value (for example, Chrome uses at most 2 hours), but even short caching removes many round trips.

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