Question 1

What is the main difference between HTTP/1.1, HTTP/2, and HTTP/3?

Accepted Answer

HTTP/1.1 uses persistent TCP connections but browsers often open multiple connections per domain to improve parallelism. HTTP/2 improves performance by introducing multiplexing over a single TCP connection and header compression. HTTP/3 is a new transport approach that replaces TCP with QUIC over UDP, reducing latency and eliminating transport-layer head-of-line blocking.

Question 2

Why is HTTP/3 faster than HTTP/2?

Accepted Answer

HTTP/3 uses QUIC instead of TCP. QUIC reduces connection setup time with faster handshakes and improves performance on unstable networks. It also removes head-of-line blocking at the transport layer, which improves responsiveness compared to HTTP/2 over TCP.

Question 3

Does HTTP/3 use TCP?

Accepted Answer

HTTP/3 does not use TCP. It runs over QUIC, which is built on UDP. QUIC integrates encryption, congestion control, and connection management at the transport layer.

Question 4

Is HTTP/2 still relevant?

Accepted Answer

HTTP/2 is still widely used and supported by modern browsers and servers. It improves performance over HTTP/1.1 through multiplexing and header compression. Many production systems continue to rely on HTTP/2 due to its stability and compatibility.

ZACCARA ROBERTO

HTTP/x – Differences

ChromeOS

Win32 disk imager 1.0.0

Mese: Maggio 2026

HTTP/x – Differences

ChromeOS

Win32 disk imager 1.0.0