HTTP/2 is the second major version of the HTTP protocol. It improves website performance through request multiplexing (multiple requests over one connection), HPACK header compression, binary framing and server push. It was standardized in RFC 7540 in 2015.

Does HTTP/2 require HTTPS?

In practice, yes. While the HTTP/2 specification does not technically require TLS, all major browsers only support HTTP/2 over HTTPS (TLS). So you need a valid SSL certificate to use HTTP/2.

How much faster is HTTP/2 vs HTTP/1.1?

HTTP/2 can be significantly faster, especially for pages with many resources. Multiplexing eliminates the 6-connection limit of HTTP/1.1, header compression reduces overhead, and server push can pre-load critical assets. Typical improvements range from 20% to 60% faster page loads.

How do I enable HTTP/2 on my server?

On Nginx: add 'http2' to your listen directive (e.g. listen 443 ssl http2). On Apache: enable mod_http2 and add 'Protocols h2 http/1.1'. Alternatively, put Cloudflare in front of your server — it enables HTTP/2 automatically.

Is HTTP/3 better than HTTP/2?

HTTP/3 (based on QUIC) is even faster than HTTP/2, especially on lossy networks, as it eliminates TCP head-of-line blocking entirely. However, HTTP/2 is still widely supported and a major improvement over HTTP/1.1 for most use cases.

Is this HTTP/2 checker free?

Yes, the HTTP/2 Checker tool on uptimelock.com is completely free to use with no account required.

Web tools

HTTP/2 Checker

Check whether a website is using the new HTTP/2 protocol or not.

Multiplexing HPACK Compression Binary Frames Server Push TLS Required Performance

What is HTTP/2?

HTTP/2 is the second major revision of the HTTP protocol. It brings radical performance improvements: request multiplexing, header compression (HPACK), binary protocol framing and server push. Most modern websites should support it.

HTTP/2 Benefits

Multiplexing

Multiple simultaneous requests over a single TCP connection.

HPACK Compression

HTTP headers are compressed to reduce bandwidth usage.

Binary Protocol

Binary frames are more efficient than HTTP/1.1 plain text.

Server Push

The server can send resources before they are even requested.

HTTP/1.1 vs HTTP/2

Feature	HTTP/1.1	HTTP/2
Connections per domain	6 max	1 (multiplexed)
Message format	Text	Binary
Header compression	No	HPACK
Server Push	No	Yes
Request prioritization	No	Yes

How to use this tool?

1Enter the full site URL (with https://) in the field
2Click submit to check HTTP/2 support
3The result shows whether HTTP/2 is enabled or not on the server

What to do if HTTP/2 is disabled?

Contact your hosting provider to enable HTTP/2 on your web server.
Make sure your site uses HTTPS (HTTP/2 requires TLS).
Use a CDN like Cloudflare that enables HTTP/2 automatically.

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