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I thought, HTTP/2 is something that the browser must support. Did you recognize, that there are some different browsers out there?

Do you recognize that someone needs to develop the sites that you consume?

The web server that comes with Windows 10 - IIS 10 is the first version of IIS to support HTTP/2.

Yes, I do. But most people just do not use the IIS. Also there are some other WebServers out there in existence.