System Design · Middle · Question 59 of 75

What does `<link rel="preconnect">` give you?

✓Correct answer: It opens the connection (DNS, TCP, TLS) to an important third-party origin early, saving time on the first request
2It downloads all resources of the origin
3It makes the origin same-origin

Explanation

Use it for a few critical origins (CDN, API). Too many preconnects waste resources.

Further reading

MDN: rel=preconnect ↗

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