System Design · Junior · Question 51 of 75

What is the main improvement of HTTP/2 over HTTP/1.1?

✓Correct answer: Many requests share one connection in parallel (multiplexing), so a page with many files loads without opening lots of connections
2It encrypts data, while HTTP/1.1 can't
3It replaces TCP with UDP

Explanation

HTTP/1.1 effectively handles one request at a time per connection. HTTP/3 goes further by running over QUIC (UDP) to avoid TCP head-of-line blocking.

Further reading

MDN: Evolution of HTTP ↗

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