Emerging Protocols Checker

Check HTTP/2, HTTP/3 and ALPN support

About Emerging Protocols Checker

Our Emerging Protocols Checker tests whether a server supports modern web protocols including HTTP/2 (h2), HTTP/3 (QUIC), and ALPN (Application-Layer Protocol Negotiation). These protocols offer significant performance improvements over HTTP/1.1, including multiplexing, reduced latency, and better connection management. Check any domain to see which emerging protocols are supported.

How to Use

1Enter the domain you want to test.
2Click "Check" to test protocol support.
3Review results for HTTP/2, HTTP/3, and ALPN support.
4Use the findings to plan server upgrades for better performance.

Use Cases

•Verify HTTP/2 and HTTP/3 support before enabling them
•Check ALPN negotiation for modern application protocols
•Audit CDN and reverse proxy protocol support
•Plan migration from HTTP/1.1 to HTTP/2 or HTTP/3

Frequently Asked Questions

ALPN (Application-Layer Protocol Negotiation) allows the client and server to negotiate which protocol to use during the TLS handshake.

HTTP/3 is the next major version of HTTP, based on QUIC (UDP), offering faster connection establishment and better performance.

Yes. Both HTTP/2 and HTTP/3 require TLS/HTTPS to be enabled on the server.

HTTP/2 offers multiplexing, header compression, and server push, resulting in faster page loads and reduced bandwidth.

Tips & Best Practices

•Monitor emerging protocols for future TLS deployment planning
•Test emerging protocol support in development environments
•Evaluate emerging protocols for security and performance benefits
•Plan migration strategies for adopting new protocols

Technical Details

Protocols: TLS 1.3, QUIC, HTTP/3, ECH, and other emerging standards
Status: Implementation status across major browsers and servers
Security: Security analysis of emerging protocol features
Output: Emerging protocol readiness assessment