Enter a domain to instantly test if it supports the next-generation HTTP/3 (QUIC) protocol. Analyze connection status, 0-RTT latency, and TLS 1.3 parameters in real-time.
Not just an upgrade, but a complete revolution of the underlying transport protocol.
Thanks to the 0-RTT connection establishment of the QUIC protocol, page loads are nearly instantaneous, significantly improving user retention.
HTTP/3 mandates TLS 1.3 encryption, embedding security into the transport layer's DNA to completely eliminate man-in-the-middle attacks.
Solves the Head-of-Line Blocking issue found in HTTP/2, performing exceptionally well in weak network environments.
We have discarded the baggage of traditional TCP handshakes and adopted the UDP-based QUIC protocol to provide you with a smoother network experience.
> Initiating Connection...
> Protocol: QUIC (UDP)
> Handshake: 1-RTT / 0-RTT
> TLS Version: 1.3
> Connection Established.
// HTTP/3 is active
Answers to core questions about the next-generation protocol
HTTP/3 is the third-generation hypertext transfer protocol built on the UDP-based QUIC protocol. Our tool simulates client requests to verify if the target server correctly responds to QUIC handshakes and checks its TLS 1.3 encryption status.
Common reasons include: 1. The server (e.g., Nginx/Apache) has not enabled the QUIC module; 2. Your firewall is blocking UDP port 443; 3. TLS 1.3 is not enabled; 4. Your CDN provider does not yet support HTTP/3 routing.
The easiest way is to use a CDN that supports HTTP/3. If hosting your own server, we recommend upgrading Nginx to version 1.25.0+ (which natively supports QUIC), listening to 443 quic reuseport, and adding the Alt-Svc response header.