New Launch: Speedflare

HTTP Protocol Checker

Check if a website supports HTTP/2 and HTTP/3 protocols.

Modern protocols like HTTP/2 and HTTP/3 provide faster, more secure connections. Find out if your favorite websites support them.

How It Works

Enter Any URL

Simply paste any website URL into the checker above. Our tool works with any publicly accessible website on the internet.

STEP 1

Real-Time Testing

We perform live protocol negotiation with the target server to detect actual HTTP/2 and HTTP/3 support in real-world conditions.

STEP 2

Instant Results

Get detailed results showing which protocols are supported, with clear indicators for HTTP/1.1, HTTP/2, and HTTP/3 compatibility.

STEP 3

Why HTTP/2 and HTTP/3 Matter

Performance improvements that make a difference

HTTP/2 revolutionized web performance by allowing multiple requests over a single connection, compressing headers, and enabling server push. It's widely supported and offers significant speed improvements over HTTP/1.1.

HTTP/3 takes it further by using QUIC (Quick UDP Internet Connections) instead of TCP. This eliminates head-of-line blocking, reduces connection setup time, and performs better on mobile and unreliable networks. It's the future of web protocols.

Global Protocol Usage

Real-time data from Cloudflare (Last 7 days)

Updated: Nov 30, 2025

HTTP/1.x
27.1%

Legacy protocol still in use

HTTP/2
51.5%

Most widely adopted modern protocol

HTTP/3
21.4%

Next-generation protocol, rapidly growing

HTTP/1.x

Legacy support

HTTP/2

Mature & stable

HTTP/3

Fast adoption