Is HTTP2.Pro free to use?

Yes, HTTP2.Pro is listed as a free public API. Visit the official documentation for current rate limits and usage policies.

Does HTTP2.Pro require an API key?

No, HTTP2.Pro works without any authentication — you can call it directly.

HTTP2.Pro — Free Public API

Overview

HTTP2.Pro provided HTTP/2 client-header testing (browser feature detection for HTTP/2).

⚠️ Status (verified 2026-08): http2.pro now returns HTTP 301 to scottvinkle.me — the domain has been repurposed/transferred; the API is effectively gone. Do not build new projects on it.

What it used to provide

curl "https://http2.pro/api/v1/headers"

Alternatives

httpbin and httpbin Cloudflare (listed on this site) — request/response testing.
Client-hint detection: BigDataCloud (listed).

FAQ

Is HTTP2.Pro working? Our 2026-08 test got a 301 to an unrelated site — the domain was repurposed.

Was it free? Yes — free and keyless.

What replaced it? httpbin / httpbin Cloudflare / BigDataCloud (all listed).

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