Protocol audit

kwork.ru HTTP/2 test

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

Test another host

HTTP/2 / ALPN result

Negotiation result

HTTP/2 was not negotiated

The TLS handshake completed without h2, so this endpoint is currently falling back to HTTP/1.1.

Check the server or CDN TLS/ALPN configuration and make sure h2 is enabled on HTTPS.

Not supported

Protocol: Protocol: http/1.1
TLS: TLS: TLS 1.3
Cipher: Cipher: TLS_AES_128_GCM_SHA256

HTTP/2 support

Not supported

Negotiated protocol

http/1.1

TLS version

TLS 1.3

Cipher

TLS_AES_128_GCM_SHA256

Remote IP

178.248.232.168

Checked host

kwork.ru

Port

443

Warnings

server did not negotiate HTTP/2 over ALPN

Tool switcher

Continue with another check

Same target (kwork.ru) — open the next tool without retyping.

Browser Update CheckerBrowser version, update status and Client HintsOpen
HTTP Header CheckerSame targetResponse headers, redirects and cachingkwork.ruOpen
Domain IP LookupSame targetA and AAAA IP addresses for a domainkwork.ruOpen
SSL Certificate CheckerSame targetCertificate chain, SAN and TLS versionkwork.ruOpen
DNS CheckerSame targetAll major record types in one passkwork.ruOpen
DIGSame targetOne record type, resolver-style answerkwork.ruOpen
WHOISSame targetRegistrar, expiry and domain statuskwork.ruOpen
Blacklist CheckerSame targetDNSBL reputation for IP and domainkwork.ruOpen
Punycode ConverterSame targetUnicode ↔ Punycode for IDN domainskwork.ruOpen
URL SplitterSame targetBreak a URL into parts and query paramshttps://kwork.ru/Open
IP CalculatorSubnet math for IPv4 and IPv6 CIDROpen
Base64 CodecEncode and decode Base64 textOpen
Password GeneratorStrong random passwords for ops workOpen
Password Strength CheckerEntropy, crack time and password suggestionsOpen
Passphrase GeneratorMemorable random word phrases for safer sharing testsOpen
BIN CheckerCard brand, bank and country from BIN/IINOpen
Domain Age CheckerSame targetCreation date, age, registrar and expirykwork.ruOpen
DMARC AnalyzerSame targetDMARC policy, alignment and reporting checkskwork.ruOpen

Full tool catalog →

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.
Read article →
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.
Read article →
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.
Read article →
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.
Read article →
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.
Read article →
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.
Read article →
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.
Read article →
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.
Read article →

Back to HTTP/2 Tester

HTTP/2 / ALPN result

HTTP/2 was not negotiated

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