Test endpoints for client and server HTTP/2 protocol support.
HTTP2.Pro API is a free Development API that requires no API key, is served over HTTPS and has unconfirmed CORS support.

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Basic DNS query via HTTP GET request
Yes. The HTTP2.Pro API is listed in the Development category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
No. The HTTP2.Pro API requires no authentication, so you can start making requests without signing up.
CORS support for the HTTP2.Pro API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The HTTP2.Pro API is served over HTTPS, so it's safe to use in production.