Protocol audit

xn----7sbd7ceg4a.xn--p1ai HTTP/2 test

SEO page with a cached HTTP/2, ALPN and TLS negotiation check.

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HTTP/2 / ALPN result

Negotiation result

HTTP/2 is supported

This endpoint negotiated h2 via ALPN, so modern browsers and clients can use HTTP/2 here.

Supported

Protocol: Protocol: h2
TLS: TLS: TLS 1.3
Cipher: Cipher: TLS_AES_256_GCM_SHA384

HTTP/2 support

Supported

Negotiated protocol

TLS version

TLS 1.3

Cipher

TLS_AES_256_GCM_SHA384

Remote IP

31.31.198.9

Checked host

xn----7sbd7ceg4a.xn--p1ai

Port

443

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Guides

Practical guides for common HTTP/2 Tester tasks — DNS records, troubleshooting steps, and links to our free tools.

http2 detection, check http/2 support, http2 tester
HTTP/2 Detection Guide for Production Sites
How to confirm HTTP/2 support, read protocol results, and avoid false positives from cached or proxied checks.
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ALPN HTTP/2, h2 negotiation, TLS ALPN check
ALPN and HTTP/2 Negotiation Explained
Why ALPN decides whether clients use h2, and how to troubleshoot missing protocol negotiation.
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HTTP/2 TLS requirements, h2 TLS, HTTP/2 certificate check
HTTP/2 TLS Requirements Checklist
Practical TLS requirements for reliable HTTP/2 support on public websites and APIs.
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h2 vs http/1.1, HTTP/2 vs HTTP/1.1, HTTP protocol comparison
h2 vs HTTP/1.1: What the Tester Result Means
How to interpret h2 and HTTP/1.1 results for web performance, compatibility, and debugging.
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HTTP/2 CDN issues, HTTP/2 proxy, CDN h2 origin
HTTP/2 CDN and Proxy Issues to Check First
Common CDN, reverse proxy, and load balancer reasons that HTTP/2 works at one layer but fails at another.
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browser HTTP/2 mismatch, server h2 mismatch, HTTP/2 browser check
Browser and Server HTTP/2 Mismatch: How to Debug
Why browser devtools and server checks may disagree about HTTP/2, and how to find the real protocol path.
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nginx HTTP/2 config, Apache HTTP/2 config, Caddy HTTP/2 check
Nginx, Apache, and Caddy HTTP/2 Config Checks
Configuration checkpoints for enabling HTTP/2 safely on common web servers.
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HTTP/2 SEO, HTTP/2 performance, h2 page speed
HTTP/2 SEO and Performance Impact
How HTTP/2 support affects crawl efficiency, user experience, and page speed diagnostics.
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Back to HTTP/2 Tester

HTTP/2 / ALPN result

HTTP/2 is supported

Continue with another check

Related articles

HTTP/2 Detection Guide for Production Sites

ALPN and HTTP/2 Negotiation Explained

HTTP/2 TLS Requirements Checklist

h2 vs HTTP/1.1: What the Tester Result Means

HTTP/2 CDN and Proxy Issues to Check First

Browser and Server HTTP/2 Mismatch: How to Debug

Nginx, Apache, and Caddy HTTP/2 Config Checks

HTTP/2 SEO and Performance Impact