How to check if my browser supports HTTP/3?

Use our free HTTP/3 browser check tool to test if your browser supports HTTP/3 and QUIC protocols. Simply visit our site and run the test. Modern browsers like Chrome, Firefox, and Edge support HTTP/3 and QUIC protocols.

A QUIC test verifies if a server or browser supports the QUIC protocol, which powers HTTP/3 connections. Our QUIC test tool checks protocol support, connection performance, and QUIC handshake capabilities.

How do I test HTTP3 online?

To test HTTP3 online, simply enter your domain name in our HTTP/3 check tool above. Our tool will verify if your website supports HTTP/3 and QUIC protocols and provide detailed connection metrics.

HTTP/3 Check - QUIC Browser Test

Test your website and browser for HTTP/3 and QUIC protocol support online - Free browser check tool

Public HTTPS endpoints on port 443 only. Checks are rate limited; please wait if the checker is busy. TLS certificates must be valid.

https://www.neobux.com/

check_circle QUIC is advertised or negotiated

check_circle HTTP/3 is advertised or negotiated

HTTP/3 was advertised in the response headers or negotiated for this check. The negotiated protocol was HTTP/3. This check does not measure QUIC connection IDs, packet timing or 0-RTT.

HTTP/3 Server Information

HTTP Version: HTTP/3

Server: cloudflare

Status Code: 403

Response Time: 85.12 ms

Response Headers

Header	Value
content-type	text/plain; charset=UTF-8
cache-control	private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0
expires	Thu, 01 Jan 1970 00:00:01 GMT
referrer-policy	same-origin
cf-ray	a52b9f60be67ddd2-FRA
x-frame-options	SAMEORIGIN
speculation-rules	"/cdn-cgi/speculation"
date	Fri, 30 Oct 2026 15:58:38 GMT
server	cloudflare
content-length	17